Hi. I hope you will give us a name that we can call you instead of "Necromancer"

Now I was in your situation about 15 years ago. Had issues for years, struggling with gender identity, at 21 it really "broke free" and at 23 I could no longer hold it and started that whole process of actually transitioning. Due to my time trying to cope with the issues, I was very reclusive and deemed un-social. I just did not do well with lots of people who were all clearly gendered and felt I did not fit in and so I had only a few friends. Some people sugested the I may be a slightly autistic, because I was really bad at making new friends and such. I dont know if this is connected to the gender issue or not - but it kept to me, I still am not really very good at opening up to people, but I am improving

So I know the situation is freaking scary and at that time back then I was contemplating suicide and was very emotional about this - the reason was that I thought I could never ever do this "sex change thing" - looking up some stories on that in the late 1990ies was not that easy either and some of them came out more as tragical stories plus odd photos in newspapers that told me "no, I do not want to look like that". In hindsight I know that the public likes tragedies more than success stories, so go figure. So I was scared almost to death. But I knew that eventually I would transition or at least try - or I would be dead by 30. So I mustered all my courage and went to the internet forum (basically there was only one back then

) and read and talked about what I feel and what others feel and did. Then I managed to meet one person in real life, who was about to transition and we went for walks and talks and drinks and just really comforted each other in that we are not crazy. This was my opening and encouragement. I could be myself there, we went to local real life support group and eventually that friend and the group gave me the strength to tell my mom, who more or less at that point, as I was already slipping out of the "male mode" and into a bit of a androgynous/effeminate male mode, told me that she suspected something like that already. She was of course still taken back and while being quite supportive in some things, I still was more or less told that it may be better to start living on my own, so I moved into the shared housing of my new friend and this was actually liberating, though I was sad about my mom a bit. To speed things up, now, 15 years later my Mom just loves me as much as ever and we get along just great and even my dad has somewhat accepted all of this and talks proudly of his daughter getting a degree at university and such.
Now of course it is your choice to go for it or not. I know a usual criticism about TG communities is that they encourage transition too much, but that is because for all those in these communities that was the only or best choice at that time. So i cannot give you tips how to cope with staying 30 years or so more in that role - franky I suspect it is almost impossible and if it is possible you will have so many more issues later on as you would basically have to cope with setting up a whole fake male personal and life that then has to be changed.
So really consider if you think you are able to do something like that or if you are saying this because you are in denial, because you feel like you deserve the punishment to live like that or something like that. Or if it at least makes sense to now explore these issues and resolve them completely for you. Even if you then decide to not go for transition but postpone it, to know that this woul dbe your way helps. Though I have heard only of few people who, once fully aware of their feelings and the possibilities of transitioning and the experience of how it actually feels like to do this, can make the decision to go back into that hole.
For me personally another thought was in the game and I think everyone will have that, so I may as well write it down: With 23 in my case (and 21 in yours), your body has yet much more potential to adjust to the change. In my case I did not have full facial hair, not many hairs on arms, none on the chest, still all my hair on the head, no adams apple and so on. One of my motivations to resolve the issue as best as I can at that time was that the longer I would wait, the harder it would get. I felt like testosterone was poisening my body. So I wanted to clear this up - know what I was, what I wanted and then decide if really I could postpone it with all the knowledge I had or if it would be much less pain overall to start right away rather than loose decades to a fake persona, moan the years and body features lost when I transitioned later.
So I would say, join here, read, see what others experience, but most of all check if you can find real life support - someone from a forum that lives nearby, a local real life support group - anything that is not just online or in your head helps to make things real.