A lot of that has changed for me recently. Going to Brazilian Jiu-Jitsu for a year now and doing more yoga has really helped me to figure out a lot of traumatic issues from the past, especially with racism during childhood.
It's really reduced my fear of socializing with people. I'm now somewhere in between extrovert and introvert and I've noticed that self-disclosure happens a lot more and interactions have improved with strangers. Even small talk happens now and then. I've always hated small talk.
I don't like the extrovert/introvert/attachment type labelling though. Reading on them or discussing them with others has some kind of effect of boxing you in to self-limiting thought patterns. It can be a good starting point to figure things out, but I implore people to not think you're stuck in your ways.