Painful sex? Please help?

Arielle
So this was my second time having sex. The first time, when I lost my virginity about a week ago, hurt so much that I started sobbing and there was a lot of blood. Today, it hurt a little going in, but got better, but when he went deeper, it hurt more, and it even hurt him. He has a little above average penis, and I am a pretty small person, so I don't know it thag has anything to do with it. He said it got tighter and tighter the deeper he went in and it was painful for us both. Does anyone know what this is?