I think you should be glad you're not one of those people who "set their minds and stick to it." It closes your mind to other possibilities and points of view. That's how politics get so polarised. At the same time, I understand what you mean. Indecisiveness was my downfall, in and out of denial, constantly questioning and giving myself "what if" scenarios. I was very young when I started questioning my gender, but I still regret putting off my coming out and refusing to accept myself.
I don't think it ever stops. I'm on T now, and this is the most comfortable I've felt with my body since I was 9. And I still question. I'm so logical, I have to continue analysing everything, trying to figure out why, is gender incongruence psychological, neurological, biological? Why is it impossible for me to accept a female body when others can accept their own physical defects? I just have to remind myself that even if somehow, I'm wrong about who I really am, all of my reality is telling me otherwise. Emotionally, logically. I'm happier and no longer self destructive. If a little vial of hormones can make me want to live again, I'm not going to end it, occasionally uncertainty or no.
I had a really bad episode earlier this year. I felt stuck between being a freak, a man with female genitals, and being suicidally unhappy and dysphoric, or dead. I came so, so very close to that last option. But the "freak" part - that's society's problem. Not mine. Society dictates what normal is, their closemindedness was what would stop me from being an ordinary guy. Well, I've said f**k society enough times that it shouldn't faze me. This is just different because it affects everything for the rest of my life. But personally, I'm not so bothered by having a body that is only, say, 80% correct. Better than 0%. I don't want to be unhappy the rest of my life. And I kept going with the hope that transition would change that, and I had a better option. In the end, I wasn't stuck. I'm alive now, and not suicidal.
You're not alone. If your doubts are about your identity, how you feel emotionally towards transition - always keep an ear open for that. If you get on T and sense something's not right, listen to your instinct. Transition's not right for everyone, and you can be trans without hormones or surgery. You can still be yourself, male. But if your doubts are about if you will ever be "male enough," or have the perfect male body... take some deep breaths and relax. If your brain is male, no matter what body it inhabits, that body will be a male body in my definition, and the definition of many others. There are plenty of guys who are short, feminine, with high pitched voices, or with man-boobs, or who have lost their penises. Plus, transguys are all guys. Real guys. And there are lots of us around, even if we're not always visible. Your body may never be "perfect," but nobody has a perfect body. Everyone has flaws and insecurities. Trans people just have different insecurities than cis people.