I need girl help? Haha?

Alrighty so I realized it takes forever to get my period! Like when I get it I have it maybe five days but I only get it like once every two or three months. Like even though I'm a virgin it kind of worries me even though i don't think it's that big of a deal or anything. I don't take birth control or anything but I heard birthcontrol regulates it more and gives you it four times a year, which what I feel like I have now. So is it strange that I don't get it often? Originally I got it almost 4 years ago so I thought it'd be regular by now. So what do you think? Thank you (: