Insecure sex

I don't plan on having sex anytime soon but, I think about my first time all the time. I don't like my body for a couple reasons and feel if "he" sees my body "he" won't like me or get turned off because I don't have huge breasts or a big butt. I know I may sound stereotypical but I don't mean too. I just get a little insecure and wonder if that's just me?