I've played hockey from 1st grade until 9th grade, and during that time, I played with 2 different girls on my teams. I don't think that any of the guys found it weird or uncomfortable at all. However, these girls were not trans, so there wasn't that to deal with.
At the same time, I imagine that, had either of the girls (or both) come out as trans, we would've just accepted it. We were a team, we were all friends, we just wanted to play hockey together! At the least, that's how I would've felt. It might have even made the group closer, as the guys would learn (probably slowly) to stop treating the FTM boy as a girl and start treating him like a guy.
And if you're worried about the guys treating you with transphobia, I can't tell you anything that I've done in the past that's worked. However, in the face of naysayers, I am of the opinion that it is best to keep your head down and walk the walk. If you just work hard, people will probably come around sometime or another. Particularly helpful is if you're one of the better players. It's hard to hate against the team's MVP, when they help the team win.
If that doesn't work, you may want to do your best to make friends with the more accepting teammates. Once you do, they will most likely stand up to your antagonists for you.
I hope some of that helps, and good luck with the NHL dream!
