You'll be fine, dude. I was a minor when I had my name changed from something VERY feminine to a very obviously male name. Hell, I even put "transitioning from female to male" as part of my reason for changing it in the first place - and I live in a conservative area of the US. There was no problem, I didn't even have to go into court to get it changed. They just mailed me my order, signed and ready for use.
If, on the off chance, you do happen to be denied, you can contest that decision. Just keep your documents organized and do your research. But really, the only way I can see the judge denying your application for a name change is if you've got a history of fraud or major criminal charges and are using the name change as a way of escaping debt collectors or something like that.
Just breathe, and keep your mind clear. Don't panic, seriously. You'll be fine dude, okay?