I need advice...

Abigail
I've been in a committed relationship for almost a year and four months now. I really love my boyfriend, and we have a lot of fun together.
But there's just one thing that I can't stand. And it's pretty significant. 
I feel like he uses me, sexually. 
He always asks for foreplay, in which I never get in return. I ask too, but he just says he doesn't feel like it, etc. He constantly asks for me to give him 'stuff' to, like oral. And I do it because I don't want to upset him, but it hurts me... Physically and emotionally... I really don't know what to do, and I need some advice!