I had a really similar upbringing. I'm relatively attractive (no model, but I like what I'm working with). But I didn't have my first kiss til 24, and didn't have another, or sex, until i was 27. I dated, but always ended it before we'd get physical. Even after I left that religious environment in my early 20s I didn't let guys close because I was embarrassed about my lack of sexual experience.

This is what I did - you could consider something similar, because it's a low risk way to explore and potentially make an ass of yourself without consequences. I was visiting NYC from overseas and I posted on reddit that I was visiting from abroad, and wanted NSA sex with someone happy to show me the ropes. I had a very busy fortnight, and when I got home I was way more open to people, and met someone I had a 3yr relationship with a few weeks later.

I also advocate real honesty, and think that anyone who doesn't appreciate it isn't worth my time. So when someone asks you about yourself, just say oh I always struggle to talk about myself, is there anything in particular you'd like to know? Most folks, having felt awkward themselves before, will be totally cool with that and be happy to ask leading questions. Also, if they've asked you about yourself, forget about wether or not you think it's interesting to talk about yourself - they obviously find it interesting, so focus on that.