I've said it before, I don't think it has to be a *need.* I think people are entitled to do things just to make themselves happier.
I wasn't suicidal; I wasn't even miserable. I thought transition would make me happiER, but I wasn't wholly unhappy as I was. I wondered for a long time if that made me "not really trans," but I started down the path anyway, and sure enough, it did make me happier.
I've now been living full-time as a woman since summer 2010 and had GRS in summer 2012, and I've never regretted it. In fact, if I'd truly understood how much happier and more fulfilled I'd be, I would have had no questions at all about transitioning. (I started transition at 32 and I'm bisexual but strongly prefer women, if that matters to you.)
Do what you need to do, and you don't need to justify it to anyone, even yourself. (If you do start taking small steps and realize you're NOT happy about it/want to go back, well, now you know something important about yourself. Even if it's not what you expected, it's an answer, and that's still valuable.)