Hi Max,
I suppose lots of people have moments during their process when they question what they're doing and feel like things are moving too fast. The thing about hormones (I can only speak from the MtF perspective) is that they don't magically change your body, so there's an opportunity, each day, to revisit and decide to continue or not. Now they DO magically change your emotional state, or can, at least. So if you're experiencing dysphoria about who you are and how you present, you might find the answer very quickly after starting treatment.
One caution on the use of MtF hormones/T-blockers is that over time, you may lose reproductive function, which is a good reason to be cautious and to move deliberately, and not rush, or at least to engage professionals, like therapists or psychologists specializing in gender identity issues.
You don't say exactly what your timeline is, and how long it took for you to reach the conclusion that you wanted to change, or whether you received any assistance from a therapist. Lots of people here have gotten answers through therapy, so if you haven't explored that, it's certainly worth your while to think about. In some places, it's a necessary step in receiving treatment, in others not.
I'm 12 months into hormone treatment right now, and I can't say there aren't moments when I stop and worry whether I'm doing the right thing. But I find overwhelming validation, day after day, that I'm doing exactly what I want. So pay attention to those thoughts, as they may or may not be warnings your mind is throwing out there. They may simply be a fear of change, which lots of people must feel from time to time. I doubt whether anyone here can make that determination for you, hence the plug for therapy, which you may receive plenty of as others start to touch on this thread.
Good luck to you in your journey. I wish you the best, both in determining your path and in taking it. I can't quote figures off the top off my head, but I believe that the number of people that regret moving on with their transition is pretty small. And as you age, again, especially from the MtF perspective, you may experience physical changes that will make your transition more difficult and possibly less successful in achieving your goals. If it's bothering you enough to seriously consider treatment, it's worth exploring with someone able to help you ask the right questions, and find the answers.
Erin