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Then talk and smile a bit

. Maybe if the girls don't share your interests, you could look for guys who do.
Myself, I try being a bit subtle about my interests, but still let other people notice (if they care, that is). If someone share the same interests as you, and find out that you do too, they might try getting to know you.
I wouldn't suggest actively promoting your interests to every person at the school however, as that would come off as weird and perhaps desperate.