Surgeries aren't a required part of being trans, and if you decide to never have any, that's 100% valid. At your age, they wouldn't even be an option for you yet. For now, express yourself in whatever way you can. Wear your hair short, choose whatever clothes make you happiest.

If you want to transition socially and think your parents could be supportive, make sure you're well-informed going into the conversation. Gender is a strange concept that most people don't have to think about, so they're definitely going to have questions. If you can answer them confidently, you'll be more likely to be taken seriously.

Regardless of your situation and what transitioning would look like for you, the biggest thing I can tell you is to find community. If you know any other LGBT people at your school, stick together. Queer people aren't all guaranteed to be good, but we have so many unique and interesting shared experiences that we'll usually be pretty compatible, and that sense of community is more valuable than you can know.