People are finding more and more that most of society are not purely all one gender or another (binary). Transgender, at this point has come to be an umbrella term that covers a whole spectrum between being purely female and male. Laura 7 and Miss Grace have given some great answers and suggestions to look at and think through.
While it is confusing, there should be no real rush to make a decision that is firm yet. Do you feel you can talk to your parents about this? These thoughts don't make you crazy but it might be helpful to talk through some of these things with a therapist (or councillor). Many schools have them available. You have a right to confidential therapy, even if you seek help in a public school. Many of us regularly go to a specific gender therapist but even a generic one can help people short original things out.
If you noticed in one of Laura7s posts, there is an area on this site dedicated to younger members. Some of us, who are older might be able to help you sort things out. However, it might also help to read about and interact with people who are closer to your age here. Also, if you think your parents would be okay with the idea and have questions.... there is an area here called significant others for spouses but also family to help support and answer questions. I know we have some members who joined because they love and support their kids but needed info and support about having a trans kid.
I wish you love, acceptance and a smooth journey to figure this out.
With warmth,
Joanna