Sex is painful now..?

So I've been having sex since I was 15.. (Yeah I know a little young) and its always felt okay. And I've only had a handful of partners since then but I've been with the same guy though most of two years. But now sex hurts.? Is it possible to have too much sex? We used to have sex like 3 times a day everyday. Now its just when I feel like it cuz it hurts. And he's starting to get mad cuz I'm blueballing him. What should I try to make it less painful ?