I am so socially awkward

I have this problem ever since I went through puberty. I used to be comfortable around other people when I was with friends, but it seems like a switch got flipped in me. I moved to a new city a couple years ago, and I found new friends, though they didn’t replace the old “besties”. Yet I feel so damn awkward around strangers. I always feel like I’m being watched, and judged. I get super awkward around women, even though I have had relationships before. I noticed this at work recently, even with other people I like and regularly talk to, I feel super self conscious and just can’t shake the feeling that I’m behaving awkwardly towards others. I get nervous when sitting on the bus, as soon as I notice someone takes a glimpse at me. When I lived back in the old place, with my old friends I had no problem with this. Mind you I’m in my 20s and feel like this isn’t normal for my age. I want to shake this feeling so bad, and I try to be more confident in my life but eventually I come crashing down again. I don’t know what to do…