As recently as last night I asked myself why I am transitioning, to me the answer came quite fast when I asked myself what the alternative were, there wasen't one.
As to what my goal is as I transition / after I transition, to me it's fairly simple, to live as a woman, the woman that I really am. Passing for me is far from a primary goal, to me that is something that I hope will come with time, and judging how people see me, I say that I'm doing good and things will only get better.
I never had much in the way of physical dysphoria though, in fact there was only one part of my body that I really hate and want to see gone because now it's a constant source of anxiety. But I'm comfortable with my body, I was (mostly) comfortable with my body before I started HRT aswell, it was not the body I prefered but I did not hate it.
Just having that feeling made me question starting HRT at all, and it took me weeks if not months before I decided that even though I don't hate the body I got, by starting HRT I will like my body more, I will feel better, be happier. For many reasons, few of them having to do with how my body would look, it would help others see me as a woman and that in itself would make me much more happy then what body I had. And looking back I can only say that I made the right choise, I have never been more happy, more glowing, never before have I felt life feeling so right.
For me SRS is something that is coming up, and even if it is three months before I even get the papers I need to go through with it, and it's looking like I'll have SRS this fall at the earliest, or more likely winter, I have already been spending most of my freetime looking into this, not just looking up information but really asking myself "why?", "do I need this?", "is this right for me?", "is this right for me, now?".
If you're having doubts about transitioning my advice would be to slow down and think about it, really think about it, ask yourself honest questions. At several points during my transition and before I questioned myself, I've questioned myself many times, and each time I've taken these doubts serious. Even if each and everything the answer has come back the same; "Yes, what I'm doing is right for me.". Transitioning, even if seen as something you "have to do" if you're trans* is something very big and serious and needs serious consideration, even if you think you know the answer, confirm it with yourself.