Okay I am 17 and I have never had sex but there are times were I don't have a peirod for like 2 to 3 months... can anyone tell me why this is... :confused:

Could be just a normal irregularity or could be something different. It would be best to go to your GYN to rule out anything serious but I wouldn't worry about it too much. It happens to a lot of women for a lot of reasons. It is often nothing serious. Sometimes the answer is simply to start on a birth control pill to help regulate you. But go get it checked.

Are you on brith control? I think that does thing to you period I think not 100% that might do it