Well, this is a complex subject, and I think it would be a thousand times better for you to get advice from an actual transgendered person. But what I can tell you is that there's nothing wrong with how you feel. From what you've shared, I can't really decide if you're most probably transgendered or not. I don't know how it feels. And while you're still young, I think you're old enough to have clearer thoughts and feelings. I'm sorry I can't help much, I'll just advise you to talk to a psychologist or another transgendered person. If you don't want anyone to find out, I'm sure there's other alternatives like doing it through the internet or even by phone.
If you ever need to talk, I'm here