No, I don't.
I wouldn't bet anything on my memories being accurate, and I consider myself an unreliable narrator when it comes to anything occurring before 2012. Even my memories from between now and then aren't the best, depression and childhood traumas have made it very difficult to recall anything of importance. I gave up looking for clues in my past when it created more stress than the probability of me being trans did, but I still get frustrated with not knowing for certain when all this began.
Rather than go through my history and injecting "trans signs" whenever I did something unfeminine (which was pretty much all the time, if you ask me), I looked at something more immediate, something I had semi-reliable memories of. My more recent (within the past three years) history, how being treated as male versus female makes me feel, and how happier I am having accepted that I was very likely, never a girl. My family has helped me overcome any doubts I had of my history, for their memories are much, much more accurate and reliable than mine.
All in all, I've become more of the opinion that I'm doing the right thing in transitioning, judging by how much better I feel after taking the steps that I have. It's a huge decision, one I've spent many hours deliberating on. But what I see in transition, that I didn't see in not transitioning, is hope for happiness. Potential for having a better life, one that I am actually living, and not just existing in. I'd rather have tried to go down this path than to never have attempted and live the rest of my life wondering why it feels like I'm missing something.