Most of my trans friends have a history of posting things on the internet, thinking they might be trans, only to go back into the questioning stage, bargaining with themselves over "do I really want to do this?"
I expect a lot of people who come here for information are doing the same thing.
A lot of people struggle with possible gender identity concerns. That doesn't mean that all of them are destined to transition right away, or transition at all, and that's completely okay.
Also, when you say "most of the trans girls I see and meet do not pass completely even if they have been on hormones for years," that one I believe is not necessarily true. Yes, to our own critical eyes, other trans people do not pass. But that's because we know they're trans, and we know what to look for. Most people don't. They accept people at face value. If they met that same person in real life, the thought that they might be a trans girl instead of a cis girl probably didn't even cross their mind. I mean, for God's sake, I look in the mirror at myself and can't see anything but a man on a lot of days, and yet I seem to pass completely at work, being properly gendered all the time, people automatically asking me questions about boyfriends and pregnancy and girlhood, stuff like that which I am completely shocked that they are asking me because to my own critical eye my transness is so obvious. We're our own worst critics.