I'm exactly in the same boat right now. The main reason I can't even hold down a job is because of my social anxiety. I try to look for jobs where I don't have to deal with people but they usually pay really low wages or treat you like crap.
I can't tell you how to live, especially since I don't even know what to do with my own life, but I know that there's more than sitting around feeling sorry for yourself. I do it damn near every day and I look back and wonder why I wasted that time and yet I do it again.
I think we all deserve happiness but we have to accept that sadness comes with that. We know what we know, it's conjuring the strength to do something with that knowledge.
I am probably the most dull person anyone will ever meet and I want to change that. I want to be able to brighten up peoples day and be generally upbeat but I am not that, I am a boring quiet person who lives in the shadows.
Just know that whatever you do, you aren't alone. Whether it's learning how to play a ukulele or sing, just know that plenty of people are never going to even try. There's nothing wrong with that either, we are all different and we all gravitate towards different things.
Something I do to maintain perspective is that one of my family members was cop at the age of 20. I am 23 and have done nothing with my life, I gotta accept that people live their lives at different paces and we are not racing. Find your path and navigate through it to the best of your abilities, you will wander off path every now and then but your destination will be the same as everybody else.