It's not only about the external.
Your mentality, from what I surmise from your first post, needs
changing.
So what if they call you gay? They are after all just kids. Fellow
councillors calling you gay? Take it in your stride.
The more you fight back, the more they relish labelling you
gay.
And really, does the 'gay' they label you with denote the true
meaning of it? I doubt so. Their limited vocabulary prolly doesn't
extend to the true meaning of gay.
So what if you are labelled as gay? As long as you ain't one, who
cares?
Unless the girl you like also knows about this label. By then, just
go all out to prove to her that you like her.
Stop whining. In fact going to gym, shouting, acting more 'manly'
doesn't help.
You lack self-confidence and a self-identity. Search for both of
them first.
When you've found them, labels such as 'gay' will bounce off you
like raindrops off a plastic sheet.