Believe it or not, it's good that you're questioning and exploring yourself. Self-testing is just as crucial as therapy and being 100% certain about who or what you are or are not is not necessary. As others have said, the gender-spectrum is vast and not everyone can be labeled. You should never pressure yourself or let anyone else push you into making a decision about something as personal as your identity. If you are having serious doubts, I would put transitioning on hold. Even HRT can have health impacts, not to mention physical manifestations, that can cause emotional damage later on for individuals who made a rash decision to transition before they really should have. Others may disagree, but I do not believe that any medical procedure, including HRT, should be a part of self-testing. You may find in a few years that you change your mind again and are ready to transition or you may not. That's ok. From what I've seen, you are young enough to have plenty of time to explore.