Well, I'll start off by listing my fetishes and possibilities of how I got them.
Indian girls - by far my biggest fetish. It's almost impossible for me to find an Indian girl of my age group that isn't beautiful and intelligent. I think it started with an Indian guy I knew online a while back (like, in December-January). He was the only one at that time on the particular forum site we were at that I could talk to and not expect to be made fun of or bullied. We had a few good talks together. I always try to group people by distinguishing traits that seem to correlate with their differences, and it occured to me that he was Indian and Muslim, and all the people who were mean to me were white and atheist. At the same time, I also had a crush on an Indian girl in my chemistry class, and something about every single Indian I met being a nice person led me to form an idea of the Indians being a Master Race (oddly enough, having my heart broken by my crush didn't change that). After Christmas break, I went back in school and noticed that the girl seemed to somehow look prettier and more attractive than when I last saw her (presumably because of the positive experience with the Indian guy online). I have this habit of basing my sense of beauty on my most recent crush (unlike most males, I select a female for her intelligence and how nice she is to me, and then I start to notice later how beautiful they are), so I guess the whole attraction to Indian girls stuck. The attraction becoming a fetish is probably the psycological effect of me telling myself mentally over and over again that Indian girls are pretty.
Feet. I think my desire for feet originated from my most recent crush. It was the first (and only) time I ever touched her... she had her feet up where I could easily reach and see them, and she was wearing one of those shoes that shows the top of the foot, and I couldn't help but rub her feet... (especially since I thought that her resting her feet on the table was an invitation to touch them, and seeing that her other friend touched her and she didn't mind). Her feet felt soooo gooood... (in case you're wondering, she didn't say anything about it or give any signs telling me to stop, so I'm guessing she didn't mind). Now, the thing about my crushes, is that I don't get very many, but when I do, they're extremely intense compared to how attracted normal boys are to any girl in particular. Combine that with the fact that this girl was drop-dead gorgeous, it was a rather pleasurable and memorable experience to actually feel her skin. I could tell you more about the girl, but that's not important for now.
I didn't feel much of a fetish for feet until just a couple days ago, when I read about a guy who had a fetish for feet. That night, I noticed that I was fantasizing about the girl's feet, and that's where I began to think of it as a fetish.