The One Girl at the Boys Party

I didnt really understand this poem, but im guessing that she really isnt used to being the only girl at a party. She seems to get a look from all the boys there because maybe theyre not used to a girls presence. As shes at the party, she seemed to have been doing alot of math in her head about what she should do and about whats going to happen i guess. She may be looked at differently because she is of a different sex.