The fantasies and attraction you had for your dad as a child is what we call in psychology the Electra complex. Its actually a sign and stage of a normal healthy developing child. Boys feel the same with their mothers. I'd say that this was okay and infact, its not illegal or anything, but the fact that you even posed this question asking if it was "weird" tells me you find it to be something out of the ordinary as well. You say this is not a "daddy issue", but if you want to find out if this is actually a problem and not something just "weird" you need to ask youself a few questions. Were you abused physically, mentally, sexually as a child? Was your father absent, somewhat unloving, uncaring, or cold towards you?
Given your mental status, I do think this is something that requires attention. Even if this is someone you want to be with, making sure its right is first getting yourself checked to make sure this is not something thats going to cause you problems in the long run. Along other stages of development you seemed to have stopped at one point and remained in your child like stage in that your behavior with this man does really reflect a normal father/daughter relationship. At this point in time you should have gained some independence. Lack of experience to grow and mature as a person can forever keep you from learning if you dont take the steps necessary. You can function and go to college, drive etc. as any other person, but I think as long as you keep yourself at this point those things can be impossible. Please see a counselour