I have difficulty talking to people about love and uality related topics?

I have no real trouble online, I suppose since it's completely anonymous, but like, whenever my friends bring up something to do with in conversation, I usually go quiet. Over time I've got to the stage where I can laugh at a joke and occasionally make a comment, but nothing personal. It just really embarres me, despite the fact that it's totally normal. I rarely ever hug people, and I've never in my whole life told anyone my uality in reality. I'm straight, but nobody I know could actually confirm this. I also get when girls openly talk about themselves ually and sometimes I feel like a bit of a pervert, though I try to act normal. I am 16. Never had any ual experience. In grade 8, my friend told me she had a crush on me, and, as you might expect by now, I froze. I kinda pretended it never happened after that. I think I have a fair bit of social anxiety, like I really avoid talking to shopkeepers, keep quiet until I know people well and they like me and other stuff like that. I don't really know what's up with me. I guess.... what do you people think about this? I'm not really sure what I'm asking for.