Hi!
Welcome to the site.
Support for transgender youth is fortunately becoming more common, with great care available. I would suggest trying to find a counselor or therapist to approach about finding care and helping you with your questions as a first step.
Depending on where in the world you are, there may be a mental health provider associated with your school that you could talk to in private. Alternatively, there may be a local LGBT center with a youth program that can connect you with a gender therapist who could help you out. These folks should be able to help you work through your thoughts in a nonjudgmental fashion, helping you to be comfortable with yourself no matter what your path in life turns out to be.
I applaud your insight into yourself, and your seeking out some assistance. (Life now is so much better than when I was your age 50 years ago, when we had to ride dinosaurs to school in the snow, uphill both ways....)
I hope you feel welcome here.
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Once again, welcome to Susan's. Look around, ask questions and join in.