How to get rid of horribly oily skin?

I go to the dermatologist and My skin has just a few zits. But I have so much trouble with oil. I wash my fac 3 times a day and I use oxy pads in between classes. and yet by the end of school my face looks like I just got out of the shower. It discusting and I am embarrased by it. what should I do?!