Is it weird that I think having sex will ruin all my relationships?

And how can I avoid this frame of mind?

I guess it’s probably because I lost my virginity young, but it’s made it weird in all my relationships. I just feel like if we have sex it will make everything different and bad and we can’t ever just have a normal relationship.
I don’t want to be sleeping around or anything, but I just want to feel comfortable in a relationship without this constantly weighing on my mind. It makes me feel awful, even just making out because I feel like it will lead to something else. So I dunno.. Advice? Anything?