What Should I Do About My OCD??

I am a teenager who has been struggling with, presumably, OCD. I recently stopped checking my alarm clock 12 times (a few while blinking) by eliminating the problem. Yet, now it has seemed to come back full throttle. I rewrite and rewrite papers and ignments. I feel they are never good enough. When things are perfect, i feel the compulsion to redo them. This has been severely affecting my lifestyle, but what can I do to stop it? Does it seem to be true that I have OCD? Should I make an appointment with a physician?