I understand where you are. My own mother didn't take me seriously on the issue 12 years ago, and it's not an appropriate time for me to come out. My point of view is that I have a goal over the next year: To obtain my nursing license. That's going to be much easier if I present as female. I'm not in a position to be taken seriously if I say, "No, I'm a man, and this needs to be addressed," right now. I have other goals. It could be as long as fifteen months before I come out, or as long as five years. And maybe it will fade in the background for me. I hope it does. I digress...
If you can stand and not waver, and have that level of moral courage, I urge you to do so. It doesn't get any easier. I have done everything from neglect myself horribly to try to prove how good of a woman I was by some very racy behavior to doing everything possible. These raw elements that you feel are you fester into wounds if you leave them untended. I think anyone who waited until they were 25+ to start transitioning will attest to that.
If you can't do that, know that it will wait. If you can't do it today, it's okay. You set definitive goals and you accomplish them on the path to living as the man you were meant to be, and that isn't just about hormones and surgery and guns and cowboy boots. It's easy to live in the closet, but it's very hard to die in the closet.