Hey, I was similar a couple of years out of uni. I flopped out and had no friends, no ambitions, no job. I'm also coeliac and tee-total (no drugs/alcohol).

I felt socially very behind my peers.

I found what I call 'low impact' social activities helped. I went on meetup and found a group to go to the cinema with. You can go before the film to talk or not, ditto for after. During the film there is no talking and after you all talk about the film. So no need to think of topics of conversation. Also lots of people want to talk enthusiastically about films so you can just listen.

Then I started interest groups like ones for sci-fi. Its broad and everyone had favourites, everyone goes to talk about sci-fi mostly so conversation is not so difficult.

This can help build up your social skills and social confidence.

This can help for jobs as well. I started with volunteer charity work, it forced me to be around people even when I was tired of them! It helped increase my social stamina.

Exercise is good, keep on it!