It is good to hear a story from someone who changed their mind about transitioning. Based on my limited experience, it seems that kind of story doesn't get shared as much as it should. So thank you.
I've had a different experience with this site, though (can't speak for other TG sites - I've only posted here). When I started posting here, I was about 90% sure I wanted to transition. After more reading and thinking, I realized I wasn't so sure. When I posted about being undecided, people were supportive and understanding. The main message I got was, "Take your time to figure this out, and definitely don't do anything you might regret later."
I'm really glad that I got this kind of message, and not the pressure to transition that I've heard people sometimes encounter. I've known I was TG / genderqueer by some definition for a long time, probably since I was about 4 years old. But I've been really reluctant to do anything about it. Over the past 5 years, I've started talking to people more openly about it. About a year ago, I decided it was time to seek therapy and educate myself by talking to people in the TS / TG community. Unfortunately, I'm temporarily living in a rural area where it's hard to find other trans people, and I can't afford therapy, so all I can do is go online. Really, what I'm learning here is just driving home the point that transition is completely life-altering and that it's a good idea to be cautious and think carefully about any doubts you have. I wouldn't want to transition without being confident that it was the right choice for me. At the same time, I've reached the point where I have no choice but to seriously consider it. My gender identity issues have been interfering with my life too much for it to be realistic to ignore them. But it's important to remember that the internet is not a substitute for therapy, and I think you're supposed to be in therapy for at least a year before starting T (?). I think this is so that people can sort through everything and be 100% sure they want to transition before doing so. In most cases, it's probably better to have to wait too long than to rush in. If people rushed in, many would later change their minds.
Also, I agree with Nicky about the categories. One reason I'm really glad to have found this site and other online resources is that I've learned that it's not just a simple matter of being either FTM TS or not TG at all - it's more a matter of being true to yourself first and finding the label that's the best fit later.