I am a 20 year old (obviously female lol). I had my very first period just after I had turned 13, and I have never really had a regular period since. Up until I was about 16(ish) whenever I got one they were fairly heavy and lasted about a week, but for the past couple of years they have lasted 3 days maximum and are very very light. I get maybe 5-6 a year, the least being 3 in one year (2009). Whilst many women dread "that time of the month", whenever mine arrives it actually gives me a slight feeling of relief.
I have read up about PCOS and I'm petrified it's that because the thought of not being able to have children in the future worries me (I know it is possible to conceive with PCOS but allegedly very tricky). The other main symptoms being weight gain (I am certainly not fat but I am not a scrawny little thing either), acne (I have never ever had acne as such, but I often get a few white heads and a couple of blind spots here and there) and excess hair (I embarrassingly admit I do have very hairy legs & arms, (I have done since a young todddler), even hairy feet and toes and also get a lot 'down there' but I do not have hair on my face/neck/back).
Would you think this is PCOS? Have any of you MNers had cycles this irregular for so long? Am I just being paranoid? 
Apologies if the post is long/TMI!