Does this mean I'm gay? Gay people's opinions?

So if I see a picture of a dude online in like underwear or something and is buff and shirtless, my heart beats faster cause im like damn, he is attractive. but i try and think of goin down on him and vice versa but i just don't get a tent in my pants, if u get what i'm saying. these are men who i am definitely jealous of. I mean i consider myself straight, but this doesn't make me gay, does it? I currently like a girl, and don't want a bf...does this mean im gay?