Dermatologist?

I'm 21 and my face goes through there different stages of being completely clear, to a pimple here and there to a full on breakout. I've tried to many different things to clear my skin. Nothing seems to be working for me. Lately, for a couple months now, my face has been in full break out mode. 
What are your experiences with going to a dermotologist? Did you see any results? 
Or any tips in general for what products have worked for you would be great!