This is killing me! Why can't I orgasm!?

I've only ever had sex with one person (my current boyfriend) and everytime we have sex I fake my orgasms. I don't feel ANYTHING while he's inside of me, I can feel his penis inside of me but I don't feel any sexual pleasure. And I'm honestly so scared to speak up because it's too late now. We've been having sex for almost a year and i don't want to hurt his feelings or something but sometimes there will be that one exception once in a blue moon where sex actually feels okay but I NEVER finish. I don't feel anything and it doesn't make sense. I can't finish from vaginal sex and i know why or what to do. Does anyone have any tips to help?

Like sex positions or something that I can do to help myself. I'm really concerned that I'm just broken or something.

I'm hoping for helpful tips, thanks girls (: