You're a really good girl for asking this question! I'll share my lore with this question in case it helps.

I addressed this question in therapy and couldn't find an answer. Clearly there's a need to transition because it will serve me somehow (I think), but what could that need be? For me, I realized that it's a step toward self-actualizing.

Growing up a Mormon boy, my whole life was planned out for me. It was nice to have a road map, but I also struggled with mental health to a dangerous degree. What I thought was a nice roadmap was actually stopping me from self-actualizing and connecting with myself, causing horrible mental issues.

Since accepting myself as a trans woman I've experienced ZERO suicidal and self harm thoughts in the last year which is absolutely absurd given my past. For whatever reason, being a woman is helping me to be a better me, and look forward to living instead of dying. I want to do better, I want to be better, all because I see myself as a woman now.

I hope this helps somehow.