Okay, so... I'm 18 years old, and a senior in high school. About 7th grade is when I started my period. Now, it's never been regular. I don't know if there is something wrong with me or what... But it sometimes is normal for 3-4 months. Then I won't have another one for 2-5. It ranges all the time. I know I'm a bit old to be asking these questions, but I just don't know if that's normal. The only medication I take is Zolaf, 50mg for depression. I don't really think that should affect it though.  Wanted to ask on here before I made appointments.