Sex feels like nothing

This was my third time ever having sex and the first two times hurt a bit. We tried to fix that by having tons of foreplay and going very slow. It didn't hurt anymore but it also didn't feel like anything, almost no sensation. There where a few times that it felt good for a minute or so but then it would go back to nothing again. What is wrong with me? Is there anything I can do to fix this? And btw I have mastrabated before and that felt good, how ever I just used my clit, no fingers. So this is very new sensation/act for me. I just want to know how to make it feel good.