Personally, I don't have too many regrets when it comes to the fashion end of things, I am still young enough(and look young enough), that I could probably experiment with whatever, and I also just like the direction that fashion is currently moving in. Once I transition, my "look" will probably just be a more colorful version than what I wear currently.
However, I do have a lot of regrets when it comes to like the social end of things I guess. I try not to focus on it much, since it makes me not feel great, and then I go through a bit of denial again.. But it just kind of sucks since I knew I was trans at 15, and just put off coming out for so long. I remember being 17 and my cousin was talking about her prom, and I was just sitting there kind of daydreaming about being a teen girl going to prom..
I know of a lot of my female friends who constantly talk about how much high school sucked, and puberty, but I just wish I could have experienced that instead of the years of confusion and isolation I had.
Okay, as far as I am going to go with that, trying to stay positive.