How to get over finding out your dad watches porn?

Oh gawd, I'm really traumatized now. I just went up to our upstairs computer to check my grades, and once I log out, I get this whole other window of some girl....ughhh....and then it all hit me o.o.....HOW CAN I GET THIS OUT OF MY MIND. I've always looked up to my dad, but now I see him somewhat on the same level as the hormone-crazed guys at my school....