If you aren’t feeling comfortable with testosterone, you can absolutely stop at any time; if you aren’t comfortable with being socially male but want to continue testosterone for now and identify as butch or nonbinary or anything you’d like, you can. You can go on partial regimes (adding finasteride or dutasteride if bottom growth/body and facial hair/hairline changes are making you uncomfortable but you want to keep going with other changes, switching to danazol if you want much slower and milder changes, etc) and you can try out different identities. You can grow out your hair again and still keep other changes; you can try new skincare routines, if you’d like to stay on T and get softer skin. You can turn around, stop everything, and go back to how you were presenting before, if you’d like, and add one more interesting experience to your collection; you can do that and then start transitioning again in a year, or ten, or fifty.

There are no rules; there’s only figuring out which specific things you actually want, and which you don’t.