Why does sex hurt me?

The first time I had sex, it hurt, and I thought that it was normal and that it would eventually get easier. But it has now been around a year and sex still hurts a lot for me. Ive tried all kinds of lube in case I was just sensitive, and Ive been trying to train myself to relax a bit, but when it comes down to having sex, its so painful. It makes my confidence go way down when Im with guys, and I just wish I could enjoy sex like everyone else seems to.

does anyone know what I could do?