I remember feeling exactly like this 3 months ago. All I did was pretty much watching twitch and playing W OMEGALUL W for couple of years. Well, I had a few irl friends, but I haven't hanged out with them since I have started college.
I don't remember what was the breaking point, but first of all, I realized, how I was literary wasting my time. Basically, since the start of the semester in September, I have started to connect and hang out way more with my former friends. I found out that not all people are dicks and I began to talk more with other classmates during classes and started to socialize more. It was quite tough at the start to get over my social anxiety, but it only gets better over time, trust me. It escalated to a point, when I asked out a cute girl in my english conversation class that I had a crush on since start of the semester and we are dating for couple of weeks.
I don't know, what is your current life situation, but if you are like me, in early 20s and you have opportunities to get into social enviroment, don't hesitate. It's all about taking responsibilities for your own life. You kinda have to figure out by yourself what exactly to do. I remember that some youtube videos for me were the biggest eye opener in realizing, what to do with my life. Sure, you can always get a help from clinical psychologist, but first, try to figure this out on your own.
Trust me, I always thought that there was something wrong with me that I can't live a normal social and fulfilling life. If someone like me could turn his life around, I don't see any reason, why anyone else couldn't too.
Sure, it's in our human nature to always want more and more, but probably the biggest advice I can give you for happiness is to be grateful for what you have.
Lastly, a small tip. It doesn't seem to be a huge deal, but this little thing helped me tremendously. Stop masturbating and watching porn. I ended up having way more energy and enthusiasm for a lot of other important things in my life. I don't exactly know why, but this helped me to stay more driven, motivated and focused.