MTF is a really hard road to go down. If you start HRT then there may be no turning back. Your genitalia may shrink and become useless and your boobs may grow and neither one my go back to normal after a certain amount of time.
I am gonna' be sooooo serious right now and I usually am not.
First off is that you are gonna' get ridiculed and called sissy, tranny, shemale, gay, queer and many other names.
First is that transgender is an umbrella term that spans everything from people wearing the opposite gender's underwear to full blown transsexual living as their preferred gender.
Test the waters to see if you can handle it. Shave your legs and underarms. Then wear shorts and tank tops in public. If you can handle the looks and so on then you may be trans. Get a feminine hairstyle and forget about the facial hair and shave that super close. If you can get comfortable with that along with the smooth body then you may be trans. If you shave you legs, underarms, trim your arm hair without guilt or feeling like you made a mistake then you may be trans.
About the hair, grow it long and just deal with the awkward stage. You may look like Justin Beiber but... You can't go from a flat top or buzzed or even a fade without the awkward stage. Once it gets girly, keep it girly. Then when you mess up and get it cut short like I did at least it will grow back girly.
OK I am gonna' go here because someone needs too. If you do all this and get really horny and then relieve yourself or relieving yourself with someone else and then have second thoughts about it then you may not be full trans. You may just be into cross dressing, which there is nothing wrong with that. It is still transgender but it is totally different than being transsexual.
If you still want to transition then have both ears pierced and wear feminine earrings, wear makeup, polish your nails and so on. Remember that when you start HRT that it isn't an overnight thing. There will be a really awkward stage in which you are in between genders. Then you will hear all the names that I mentioned earlier. Even after HRT kicks fully in and the thingy shrinks and the boobs grow, you still may not be fully passable. If you are willing to live with that then you may be trans.
For me dressing feminine does not turn me on. It is a pain in the ass shaving every day. It is a pain in the ass choosing clothing for the occasion and making sure my makeup is just right. It is a pain in the ass taking care of my hair even though it is way shorter now, but it still has to look right. To me it just feels right to do these things. It doesn't turn me on but makes me comfortable with who I am on the inside.
I have been on many sights and have heard horror stories from people that thought they were women to the point that they had SRS even and then regretted it. Now they are trans men. They have to take T to be men again. Same with some FTMs, they decide they made a mistake.
I personally knew from an early age. When I was prepubescent and people told my mom and dad that they had a cute daughter then I felt secure. If they said something about their son then I felt really insecure and self conscious. When I was diagnosed with gynecomastia it actually made me feel good and in no way self conscious. I mean a boy having boobs at 14 and feeling really good about it? I couldn't even take gym class after 9th grade and that was awkward even. The school put me in study hall half way through my freshman year. I dated girls but they laughed at me when I couldn't perform. They actually turned out to be better friends than lovers. I made a statement at my senior prom with my boyfriend at the time and showed up in a really nice formal gown but was turned away at the door. We ended up doing our own thing. I passed but everyone knew me.
But we had more fun than we would have at the prom. My diploma was sent to me 3 days before graduation instead of me walking up on stage when I graduated. Fuck 'em. I know I am and who I was.
I don't want to bring anyone down but it takes a really strong person to be a trans woman or trans man. Make sure that you have the total drive and total conviction of who you are to go down that road. Spend a year or two shaving your body along with your face, then go and buy makeup and actually wear it, shop in the women's section for clothing and wear it out in public, pluck those brows, remember a handbag or a purse is part of the outfit and can you handle all that and not be totally passing? See a gender therapist to explore those feelings and find out who you are and where you want to go. Sometimes there is such a thing as low dose HRT that won't change much but will really help with gender dysphoria. Sometimes hairless legs and underarms will help even but get ready to hear some shit.
This is the most important thing though. No matter what anyone says, decide who and what you are on your own. Don't let anyone else tell you who and what you are. You know. Don't let society judge who and what you are. Be you and fuck everyone else. But, make sure that who and what you are is who and what you wanna' be for the rest of your life because you may not be able to go back. I can't but don't want to.
I really hope this helps.