This is such a tough one - I'm in two minds about it...
Part of me wishes I'd gone with the instinct I had when I hit puberty and began to realise that I'd always felt like a boy - I began to tentatively dress and present as male at around 16 and did so, albeit inconsistently, until I was about 22, occasionally even binding in public, but not ever coming out to any friends or family as trans... Then I 'chickened out,' in a manner if speaking, and made a disastrous attempt at living as a woman for a few years. If I'd stuck with my first instinct, I might be far further along in my transition now, which is what I currently desperately wish for myself.
Though another part of me acknowledges that all of my experiences up until this point, including those attempting to live as a woman, are in some way valuable. This is what I use to comfort myself when I feel like maybe I've wasted too much time. There are a hell of a lot of difficulties, challenges and traumas that come along with being trans, but part and parcel with it too is that we get to experience life socially, if not mentally and emotionally, as both women and men, and I suppose in a lot of cases it can make us stronger people. Whether or not it's made me stronger, I don't know, but it's certainly given me a wealth of social experience, not all good and not all bad, but all useful.
I also wonder if perhaps I didn't see the transition through the first time because I wasn't quite ready. It's impossible to tell whether, if I had transitioned younger, I would've looked back and wondered whether I could've been happy as a woman, but it might've happened. Now I've given the woman thing a damned good go, lol, and I know I just can't live like that. I'm certain I'll have no regrets. Of course I know that a lot of trans men are consciously aware and certain from a very young age that they are men - this is just the way it happened for me.
Maybe I'm making the best out of a less than ideal set of circumstances, lol! Though if you can't do that, what can you do?