HELP!

I’m 17 and have been dating my boyfriend, 18, for three years now. He’s attractive and turns me on... but when we have sex, I feel nothing. We broke up for awhile and I had a fling with one of my good friends (don’t suggest ever doing that) and again, still felt nothing. 
Is there something wrong with me? I’ve asked this question before and people say that we usually tend to hype sex up and it doesn’t actually feel as good as everyone thinks it will but I literally feel NOTHING! 
(Both of them are average sized, 6-7inches) 
HELP ME FIGURE THIS OUT!! PLEASE!!! 😭