The questioning and seeming inability to be sure is very common, myself and countless other girls have been through it or are working through the various stages. For me, a combination of the increased frequency feelings, thoughts, and desires of being a woman/not feeling like I'm right in my own skin, and seeking out all of the resources to answer the question possible helped me to be sure, but it takes a lot to come to that conclusion, especially for those of us who lived their lives in repression and denial. I read all kinds of personal stories and articles. Eventually, I read about reframing the questions you asked yourself. Instead of asking "Am I trans?" I started asking "Am I cis?" Suddenly the answer to my questioning became so much more clear. That's when the cracks in the walls I built up started breaking open. At the time, I had been searching for any other explanation that being transgender. it wasn't the answer I wanted, but coming to accept and be proud of who I am came very shortly after. To be clear, any way I approach it, I still don't want to be transgender. But I am a woman, even though I was born in the wrong body, I want to be a woman, and I want the world to see me for who I am.