I personally know four guys who have become or are becoming gals. All waited until they were legal adults. None have been harmed by this wait. I also know a couple who wanted to transition earlier but weren't allowed to. They are thankful for that now, as they realize they were just confused teens.
When you were 14 did you really know what was best for you? Or were you just 14? I thought I knew everything back then. Turns out I didn't know or understand quite as much as I thought I did. If I had had the opportunity to transition back then, I just might have, just to piss off my parents. I didn't really fit in with the boys back then, it would have made a certain amount of sense to my 14 year old immature brain. That would have been a horrible mistake, as it turns out I'm not trans and it also turns out my parents weren't the idiots I thought they were.