If it's not your thing, ignore the ball-scratching frat boy behavior of your peers. Depending on how old you are, they should have grown out of it by now. Just because you're male doesn't mean you have to prove yourself to others or concern yourself with any sort of hierarchy. If you're not cool with their "testing" you all of a sudden, make it clear.
As for the girls--haha, it happens. Like rejennyrated said above me, maybe it's the pheromones. More than that, it might be that you're exhibiting more confidence and it might also be that you seem happier and girls find that attractive. It also probably has a lot to do with curiosity--you're something of a mystery to them if they catch wind of your transness. You might find more and more that biogirls make you roll your eyes because of this.
Yeah, it's no fun being the token ->-bleeped-<-, but just consider it as your being welcomed.