I went to college and met a transfem enby, making me realize just how cool trans people were and how much affinity I had for them. I then explored trans spaces on Reddit for a couple years, finally feeling like I found my people even though I didn't think of myself as one of them.
Then I found egg_irl, and my goodness did it scare me. Being around out and proud trans people was fun, but the serious notion that I could be one of them was so terrifying that I avoided it like the plague. It felt like discovering an infohazard that was bad for me in some way. However, I just couldn't keep myself from coming back; like I couldn't look away; like some supernatural force was calling to me.
The biggest reason for my doubt was that I never once consciously wanted to be another gender growing up. I only knew that I was miserable, and while I wanted to want to be a girl, I didn't have enough experience to know I wanted to be a girl. What I was able to accept was that I hated being a man, as I did have reference for what that was like.
After finally getting more comfortable with the idea of being trans, I finally decided to try identifying as nonbinary. The few people I did tell helped me confirm that I was not cis, as I was really happy when they didn't treat me as a man. However, it was only when I experimented with femininity that my eyes were opened to what I really wanted. While I got to crossplay in videogames before, feeling like a woman in irl social situations just felt undeniably right, even moreso than not being a man.
Having actual experience that was impossible to ignore eventually tore through all the doubt and fears. The shell was finally obliterated when I imagined being a mom in depth and realized that it made me more happy than any future I imagined for myself as a man. Not only was my perspective on having kids completely rewritten, I finally graduated from denial to the closet.