I used to see myself as a nerd, but mostly because that was kids at school told me I was. At one point I even had a brief weaboo phase where I referred to myself as an otaku(not knowing what it actually entailed in true weaboo fashion) in a bid to try and remove the sting, but that didn't work for obvious reasons.
I was a "nerd" in the sense that I wanted to succeed in school for my own reasons, and I have interests that went against the grain of whatever passing fad my classmates were into. I liked rock music, not whatever Disney "tween" music was big at the time. I didn't like bad Disney and Nick sitcoms rife with canned laughter, I liked anime. I didn't like sports, I liked theatre and art. I don't have typically macho qualities such as big muscles, and I grow my hair out(not to tomgirl levels, but most guys were on the sports teams and would either shave their hair, or have lose most of it before turning 20). The problem is that kids in school came up with the stupidest reason to call me a nerd and I was just too timid to try and make a witty comeback or two. The way my classmates acted sometimes, you'd think they were stuck in the mid/late 20th century (which they might had been for a time until Jersey Shore hit it big)
Now I acknowledge that I have interests and traits that aren't mainstream for guys, but the good thing about college is that you aren't ostracized for giving a crap about my school work or something stupid like that. Though I will refer to myself as a nerd sometimes, I do it when I'm feeling really depressed and self loathing. Nowadays, I generally consider myself more of an eccentric than anything else, but that's mostly because I'm still trying to purge old thoughts that I had in high school.