I think if there is to be meaning and purpose to it, I have to put it there.
During my transition, I've had some thoughts along this line.
For one thing, since beginning transition, I have experienced love and friendship far beyond what I would have expected, or thought to exist. And I have thought sometimes, maybe I was meant to go through this, to give me that opportunity to experience that.
Also, there have been many opportunities to teach others about what being trans is all about, and I always enjoy doing that. I love having a conversation with someone who is asking intelligent questions with an open mind and honest curiosity, even if the questions are somewhat personal. I have never been asked about my genitals.
I also enjoy helping others who are in the early stages of their transition. I think sometimes this might be part of my purpose. It certainly seems like a good thing to come out of my own journey, and one for which I am particularly thankful.
So I guess from my POV, there are a number of possible ways to look at it. I do NOT ever think my life is useless or wasted (used to, tho). I used to think (in my early transition, about a year ago or so) that I would not wish this on my worst enemy - I viewed it as a horrible tragedy. Now, however, I see it as a wonderful adventure, and a ceaseless opportunity. YMMV...