irregular period QUESTION

[whatever4.livejournal.com]

I know general questions have been asked about this, but I haven't found an answer to my exact issue.

I am 21 years old.
I have an appointment to get a pap smear in August, but I was just curious if anyone knows anything about this.
I have been skipping periods like crazy.. sometimes 2 months, but usually 3 or more... And the last two times I've finally had my period, it last for a few hours.. not even a full day....   Does anyone know why this could be happening or if it could be a serious problem in the future if I decide I want to have kids??

Last time I went to the doctor, I told him that I skip all the time but I didn't think about telling him that it is sometimes for less than a day, but I will tell him that in august....    He told me that if I normally skip them, then it shouldn't be something to worry about and I don't need to treat it unless I really want to take birth control or something to regulate it... but it was no big deal cause everyone is different.