No need to apologise for the question.
There isn't just one answer to this, though: it seems that there are many ways to react to GID, and different people consider different aspects of gender as important. Yes, some of the women here have said that their main reason for SRS is to be able to pass in locker rooms or similar places and others have done it mainly to be able to change their legal gender, but still others have said these aren't very big issues, they simply must do this to feel complete. For the men it's about the same, although where the girls worry about passing without knickers the boys worry about passing without a shirt.
I'm firmly in the because-it-feels-right camp. Over the years I've mostly found a social role that I can live with, so by now my main gripe is about my body. The overall plan is to make such changes that are necessary and possible, and let others view me however they want to. I still think it unlikely that I'll ever get surgery, although I'm even more certain I'll never be entirely sure about whether or not I need it (unless of course it turns out I do). If I do, though, it'll be to feel like myself, not to get others to see me in some particular way.
Nfr