I think you need to get yourself properly socialised before you start dating. My brother lived like you until he was 30, he didn't get a job promotion he really wanted- he withdrew even more and we were s concerned for him. He started anti depressants and hasn't been the same since- he's got a group of friends he hangs out with, he's moved out of my mums house. I'm not saying they work like that for everyone- I'm on v strong anti depressants just to get through the day tbh.

So yeah- Maybe go see a doctor if you havent
And try to go out socially a bit more, you need to practice a bit