It sneaks up on me sometimes, yes. It's useless because I can't change it. I figured I was trans when I was about 12-13 years old and waited until I was 19 to do something about it. I had enough problems I though and if I just kept going I'd be okay. Wrong!
Except when I do get regretfull, I think about and realise I probably wasn't wrong. I was right! I had too many other issues until I was 19. I wasn't ready. I can't even begin to imagine what a trainwreck my social transition would've been if the scared, depressed and very negative 16-year-old-me would've started it without working through everything I worked through to even get to my 19th.
The timing was perfectly right. I was ready when I was 19 (almost 20 actually). And I'm very proud and glad that I started when I needed to and was ready to go.