What to do about oily skin?

I have had VERY oily skin for a long time now (I'm nearly 16). When I was younger I used to get spots with it too, but I don't get spots anymore (due to age and this stuff I got from the doctor, and also being on the pill which I heard helps to prevent spots). I went to the doctor and got some cream for my spots, and that stopped my oily skin for about a week. I asked my doctor what I could do about my oily skin, and he told me that I should let my skin breathe and not wear make-up. However, my skin is still very oily even when I don't wear make-up, though it is more oily when I do wear make-up, but still.. My mum also has oily skin, so I'm afraid it could be a hereditary thing.. What can I do to reduce the oiliness of my skin?