I second that!! Arent there girls @ the gym? do you live in a dorm? offer to run w/ one of hte girls so they'll be safer? do stuff you LIKE! it'll give you common ground to start on. For me'n Juan, it was a metallica T-shirt. really, can be ANYTHING. see something interesting? ask about it. Ask about the homework due tuesday, WHATEVER!
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and not having a gf or a date is not un-normal, just means you're still gettin' comfortable w/ yourself. And when that first chick shoots you down, DO NOT GIVE UP! Keep trying, I promise we're not ALL evil.
ps: don't be too aggressive. you're a big guy. you'd tower over my by a foot, to give you an idea. You're gonna have to be gentler to get around that tough guy first-impression you're going to make, just by walking up. unless that's what you're looking for, of course, but remember that large strong men who are aggressive tend to look scary. (to me, at least, but this IS personal opinion, so, take it w/ a grain of salt.)