I think my dad might be a pedophile and I dont know what to do ..?

Although he is your dad I feel he has robbed you of something special, that healthy father - daughter relationship that I feel is so sacred now-a-days because of his selfishness and unhealthy lustful desires. Your father has not changed and you will need to watch your ociation with him from now on. If I were you I would limit it all together. If your dad isn't an outright pedophile then he is what you call a "closet pedophile" who watches and enjoys those things in the privacy of his own home. Yes, it is disgusting and watching is just as bad as participating in it if you ask me. When you get married and have children of your own, you will come to actually hate your father and with good reason. Having children of your own will make you highly defensive when it comes to these kinds of things especially if you yourself were abused. By all means do not ever ever leave your future children unattended with your father. He will be tempted to abuse them. I can say this certainty because at this point in your father's life, he has hardened his conscious to the point of justifying his actions of chatting with pedophiles and having those websites of young girls saved on to his computer. Seek out other friends and family members that can help you get through this. Withdrawing from you father is not going to be easy but in my opinion necessary for your mental well being.