I socially transitioned at 13-14, meaning I started presenting as a boy and changed my name (not legally, obviously). My family is unsupportive so they tried SO HARD to make me conform to back being a girl... [cringe] I tried that for few months at 14 - and it made me contemplate suicide, I was so unhappy and it felt so wrong. I felt like a guy in drag, basically. I wore girl clothes and a bra - but inside felt I was still a guy...!
This was YEARS ago - I'm an adult know - and though I still haven't been able to transition (due to various reasons, access, money etc.), I've always felt a guy inside since. I used to pass sometimes even without hormones - right now I don't, so I'm basically read as a woman/some weirdo

. I still have huge fears about starting T. But I still want to be read as male - that hasn't changed since I was 13...!
Also I didn't "always" know (before the age of 13). Before that I played with girl toys etc. - but mostly because my family refused my every request to get any "boy" toy etc... I wasn't ever allowed to have a single piece of masculine clothing either :/. So this was wearing me heavily back then because I feared "I was not really trans" for not having "always known". Now I have combed through my life & childhood and come to the conclusion that actually "I always knew". Inside I felt weird on many occasions... and did gravitate towards boy things but was hugely shamed for it. But before the age of 13 I identified as a girl (though fantasized of being read as a boy). This is to say that if you have those fears that you are "confused" or something because you haven't "always" stated you are a boy or presented as a boy before, those fears are unfounded

.
What matters the most is how you feel right
now. Take one step at a time! Concentrate on the now, not years ahead. You don't have to get on hormones yet, I still haven't and it's ok,

. Don't feel pressured to decide, ever! (I'm still not 100% certain I will ever get on them.) Approach this from a curious point of view. Ask yourself questions as "Does this feel right?" "Do I feel good about this?" "Does this [whatever] make me happy?" etc.
But don't DENY yourself the freedom to self-identify as a boy if that's what feels right right now! You don't need to decide whether to go on T or not. You can try to visit a gender therapist, though, and feel things around

. But if presenting as a boy feels the most comfortable right now, do that! Use your preferred pronouns, name and clothes. Present as a boy to your heart's content!
Don't EVER let yourself be forced to present as a girl if that does not feel right to you!
Concentrate on what feels right on the inside: Does being seen as a boy make you smile?
Remember that not ALL guys ever get on T! (Take Ryan Cassata as an example.) But my advice: Take one day at a time. Always know that if you wanted, you can always reverse back tomorrow,

! That idea might help. It might help to know that you can reverse back even after years of taking T. People have done it! So, if some day you magically "felt a girl again", know that you can always go back presenting as a female! But as long as you feel like a boy inside, just let yourself be. The first thing is to get to the supportive gender therapist.
As an addition I highly recommend this book:
You and Your Gender Identity: A Guide to Discovery
by Dara Hoffman-Fox (licensed gender therapist)
It has helped me tremendously. It is not a read - it only contains exercises to contemplate your gender and everything and tips to battle anxiety etc. Things you would discuss at a gender therapist's office. At least get the book if you can't go to a gender therapist right now!
But never EVER let anyone pressure you into anything!