In the early stages of deciding if I should transition or not, I had some problems accepting it at first. I thought maybe I wasn't "Trans" enough to justify transitioning, even though I knew I wanted to. All the signs were there, but I needed to prove it to myself so that I was sure I wasn't making a mistake.
I hadn't come across any stories online of people whose histories were exactly like mine, so although I met a lot of the criteria, I needed that final push toward acceptance... and then I came across a transwoman's life story online that was like it had been ripped straight out of my mind. It went a long way towards helping me realize that maybe I wasn't so crazy after all, that maybe it was indeed the path I needed to take. It seems to me like you may be experiencing something similar...
Alex, I hope you find what you need to make your decision, I can tell by all your posts that it's been difficult for you. Just remember, you don't need to prove anything to anyone else... it's about what is right for you.
If you haven't already, why not send that person a message and see if they had the same concerns as you, and how they handled it. A different perspective is sometimes all we need...