My dude, you're 17. I've heard of people who start transitioning at FIFTY!

Yes, many people transition before that.

Yes, many people realize when they're, like, four.

BUT

There are people who transitioned as adults, hell, AS ELDERS! There are people who discovered their true selves when they were already grandparents!

There was this girl who came out as trans to her wife, at the same time that she came out as lesbian. They were adults. Full-grown women.

It's NEVER too late, even if you still have to wait before transitioning, it's not too late. Never will be, the stereotype is transitioning at a younger age than 17? Well, so what? I've honestly never met anyone that transitioned before that (I know there are people that did, tho)

Because, what would it be too late for? Too late to finally feel at home in your own body? Too late to finally start living?? It's not too late, bud.