Though I agree 100% with Dena about being sure, I also want to point out that T changes are far from instantaneous. If you wanted to give it a try, there are few changes that come quickly that will not go mostly back to what they were if you quit. Noticeable facial hair takes awhile to grow and thw bottom growth is something that you quickly get used to and forget you didn't always have (at least in my case). Hair loss is a possibility, but unless you are really predisposed to it then it is unlikely to happen within the first month. So you could always try for a few weeks and see how it makes you feel. T is very powerful, yes, but not powerful enough to completely override female puberty and years of estrogen exposure in just a few weeks.
Everyone is different, but in my case if I were to stop T now, at 5 months on it, I have zero doubts that I would quickly pass as female again. I have a lot more masculine traits now with a deeper voice, more body hair, bigger shoulders, and a squarer jaw, but it is not enough to override my female trait 100% of the time and without regular T I am sure I would soften so much I wouldn't pass at all.
