I want more sex!

I’ve always had a problem in relationships where I was the one who wanted to have sex all the time. The boyfriends that I’ve had would try to be on my level (sexually) in the beginning but then they tell me they can’t keep up with me. I don’t know what’s wrong with me and why I want it all the time. I know I’m not a sex addict, but when I don’t have sex I get all bummed out and start wondering if it’s me turning them off.