I have barely any periods if I do it may just be a little spotting but not every month I just had a heavy period last month but have missed the next month! This has been going on for a long time maybe a year ish but ignored as friends said it's normal to have irregular periods but I'm not sure! I never really took track of my periods so I'm not sure how many months I'd missI'm 20 years haven't been having sex I'm also a student so have been drinking quite abit in this time could that affect it ?