I used to think the same thing mfs, in fact sometimes some part of me does tell me im a pedo every now and then, but not nearly as much as before (a year ago, im 19 now). It would be like tall 9th grade girls that looked my age that I would you know, be interested in, and that kind of freaked me out. Those thoughts just kinda went away though as I became focused on other things more.
Think about it like this: Hundreds of perfectly heterosexual guys go to a bar, pick up what they think is a fine sexy lady, which turns out to actually be a guy. It happens, people are attracted to a certain set of physical features, and it just so happens that sometimes they are found on a person our society (rightly or wrongly) or ourselves tell us is improper.