Orgasm?

So I have this problem... My boyfriend and I have been together for a year and 3 months. We love eachother deeply, so in june we decided to have sex for the first time (we were both virgins) and it was suprisingly great for the first time and all. After that we had sex 3 times (not much, I know, but we just can't seem to get the opportunity) an it was really great. But the problem is, that I just can't orgasm. I'm enjoying  myself, but I never ever orgasm. Even rubbing the clit during the intercourse doesn't help. At all. Please help me, why is this happening?😰