How can I find my dad?

I know nothing about my dad. And for some reason the past 3 years that’s all that’s been on my mind. Its getting worse, that its to the point where any older man I look at I day dream about. I even write stories about it, or even rewrite books that have to do with father and daughter stuff. I know I must sound crazy to you guys but I just cant help feeling that way. I’ve seen “What a girl wants” so many times I know all the scenes and the words to the whole movie. It doesn’t help any that my mom is gay, and freaks out every time I try to bring it up. She wont tell me anything about him. Its like she wants to be my dad, and she wants her girlfriend to be my mom, they want to be this big happy family. But we cant because its wrong, it even feels wrong. I want my mom to be the person I talk to with boys not the one to hate them. I want her to wear dresses and date guys. I want a father figure that is a guy not a woman. Please help me anyone.