First time

So I'm 16, and I really think I'm ready to have sex. I've been waiting until I find someone I want to do it with, and this guy is really good to me and I think we want the same things. I'm going to be unbelievably careful because there is no way that I want to get pregnant for a looonnngg time. When it happens I'm going to tell my doctor and get on the pill. Anyway I need some opinions to help me be careful in every way possible, and still have a good time.