Living for the sake of living is worth living for. We are only alive and able to experience life and the universe we live in, for a very short blip in eternity. It is literally a once in a lifetime opportunity before we no longer exist for eternity. I am an introvert and have no friends either. Yet I make my own fun. My hobbies do not require others and I chat with people on the internet all the time via various social media. I also got married young and my wife became my best friend and only friend for much of our marriage. She is an introvert too but seems to have come a little bit out of her shell in her old age but only because my cousin introduced her to her group of friends.
Do not look for a reason for life. We are here for only one thing, to pass along our genes. All else is made up by mankind who cannot accept that death is final. We are following the stories, moral and teachings of men from thousands of years ago when it comes to religion and yet we do not accept the medical teachings of that time for some reason.
Just accept that you are alive and accept it for the gift it is. I am sterile so I cannot even pass along my genes and yet I have had a very happy life.
Does your therapist prescribe any medication for you. Some do not and I only found peace when I was put on antidepressants. Now I am glad to be alive and always happy every day. I have had friends at times but I have moved 13 times so hard to make new friends as an adult because most already have long time friends and you may not fit in with some of their group. What I did was take up hobbies like amateur radio, target shooting, stamp collecting, coin collecting, etc., that did not require others to enjoy.
Society makes us feel that there is something wrong with being a loner. They are wrong. There are a lot of advantages to not having friends. We get to do what we want, when we want to. We do not have to dress or act in a certain way to be accepted. We do not care who likes us or not. No one is calling me to help them move or asking for a ride somewhere. I am free to explore my areas of interest without someone calling me a geek, making fun of me or calling me a blood thirsty pro gun Neanderthal.
I do socialize sometimes when my wife's friends invite her to an infrequent get together. When I am in a group I tend to draw all attention to me with my sense of humor and stories about my world travels. I am a very alpha male so I tend to want to take control of my situation. I also have a very high IQ that puts people off most times due to nothing I do other than know a lot of things that they do not. They are afraid to say anything in front of me for fear that I will think they are stupid. That is on them. I never called anyone stupid. I also came back from Vietnam with PTSD. These are the main reasons I have no friends and was depressed in my younger years. I self medicated with illegal drugs for 3 decades until I decided it was time to tell my doctor about my problems.
So I am a loner. I am sterile can cannot accomplish the reason for life. I do not need a reason for life. Trying to find one will only depress you since there is nothing but reproduction. It was when I realized that being a loner was complete freedom to do and be what I want to be, that my attitude changed. I stopped thinking that there was something wrong with me for not thinking that I needed a reason to live. I used to wake up thinking about suicide when I was much younger and even attempted it once but no one found out. My wife still does not know. I just want you to know that I have been in your shoes and am so glad that I did not kill myself because my life turned out fantastic.
Most times people commit suicide due to the way they think of themselves or how others' think about them. It is all in their head as they are healthy and have no reason to die other than beating themselves up. My cousin killed himself. His parents are rich. They financed three business of his that failed and he thought he was a failure. He did not have to work at all and the businesses he started were more hobbies than a business but his parents indulged him rather than tell him that they were bad ideas. He hung himself because HE thought he was a failure. I have failed a lot before I succeeded. You need to realize that you control how you feel about you and not external things. Therapy helps some, but not me. I need prescription drugs and I finally made peace with that.
What I did with my life was travel all over the world, 21 countries. I travelled alone except for a few vacations. I enjoyed being alone. I saw the sights I wanted to see and did the things I wanted to do. I decided not to squander my one chance in eternity on being depressed so I set out to experience as much of life as I could, sexually, travel and otherwise. I met my wife on a train coming home from work. I was not looking for a woman but when I saw her I feel in love. We were engaged 3 weeks later. I guess I was afraid of losing her and she had become my best friend. All of her friends got married and moved away or were away in college. So we were each other's best friend and it worked out well for us. Do not try to predict your future. My future is nothing like I envisioned it. It is like nothing I ever imagined it could be. I almost did not let that unknown future come to being and would have let all the pleasure I had in life never be. We are all going to die eventually so why rush it. I can see suicide if you are dying from an incurable disease and are in a lot of pain. Other than that, better to just let time take its toll and experience as much as you can with this gift of life and awareness that we have been given.
Google the book "Party of one" at https://www.amazon.com/Party-One-Man.../dp/1569245134
It change how I view myself. I also read "Gifted Adults" which let me learn that I was not the only one who felt like I did growing up with a high level of intelligence which I hid from everyone. It nailed my life and how I felt and gave me answers while making me feel normal. Spend time trying to find your path rather than jumping off the cliff. Certainly you can endure a blip of time in eternity. It is so small as not to worry about. Even if you just enjoy watching movies, a sunset, the stars at night and the wind in your face, that is better than not experiencing that.
Look at my profile and see what choosing life did for me.