Why is my vagina a darker color than the rest of my body? And why is my clitoris stretched when I have only been with 2 men?

Sounds like you have been doing some investigation, which is a good thing, it doesn't hurt to know every part of your body and what's going on. Some women have darker inner labia, etc, same as some men have darker genitals, etc. As for your clitoris, because it is long has nothing to do with how many men you have been with; some men have long penises, some women have long clitorises and the other way around. Don't worry about it, its is all normal.