You could be right about fearing being forced in social transition. Its been so long I can't really recall what I was thinking when I started. There's basically no chance I'll that will happen to me, no one's even noticed a far as I can tell. I do live an unusual lifestyle so that may not apply to everyone. Its possible I'll accidentally out myself one day, but chances are it wouldn't have enough impact for force me to social transition.
Physical changes are slow and you can moderate them with dosage, assuming you're able to cope with doing that. I don't feel its a realistic fear if you're able to control how you dress and present yourself when out.
The thing I do worry about is the mental changes, and it has caught me out. Hence the upgrading from low to transitioning HRT. I don't think I have any social dysphoria, but I'm finding the hiding everything quite oppressive these days. I'd also quite like to get a electrolysis, BA and probably FFS, but that would out me.
My feelings have been changing over the last year, perhaps because of HRT. Its hard to describe, but before it was more like I wanted to be female and now its shifted to I am. Its quite a deep change. There's still plenty of male in there though. I'd guess social transition would bring more of that.
On the mental side, I think a fair number of people start HRT and find they just have go all the way, really quickly.