Congrats on cracking through your shell, former egg!
I know it's scary, but you're gonna be okay. There's an internet-full of trans sisters, brothers, and others who are eager to help each other up. You'll be on this side of the conversation sooner than you think.
The most important thing to know off the bat is the Egg Prime Directive, https://genderdysphoria.fyi/en/am-i-trans
My good friend Lily coined the phrase “Egg Prime Directive” to describe the fact that trans people have an unspoken agreement not to tell people who are questioning their gender whether or not they are trans.
When someone is just told they are trans, that opens ground for denial; it activates defense mechanisms built by internalized transphobia, and it has a high probability of pushing them further into the closet, if not making them outright transphobic. Even when it doesn’t, it leaves ground for their own subconscious to reject their dysphoria, claiming that they were just manipulated or deceived. The much more effective strategy is to talk about your own experiences with dysphoria so that they see the common grounds and come to their own conclusion about their gender. The code doesn’t forbid helping them to explore their gender; it forbids assigning a gender to them. Or, to put it more succinctly, you cannot be told what the Matrix is; you can only be shown.
After that, the most important thing is to be true to yourself. There's no one right way to be trans, it's up to you to decide how open you want to be with your identity, whether you want medical assistance to transition, etcetera.
It's definitely not too late for you, I started my transition in my late 30's and I've seen trans folks who only got started in their 60's. Learning to be a girl is something you can do at any age and there's lots of resources for it, but equally important will be the unlearning of internalized transphobia and habits that don't serve you anymore.
So, just relax, take a breath. Spend a few minutes meditating on how weird it feels when the relief of finally acknowledging the dysphoria is combined with the fear of how trans people are treated by normative society. Let the initial wave of panic, excitement, and existential dread wash over you. Then, start thinking deeply about what you want from life as a trans person and how you'll achieve it for yourself. Everything else will flow from that~.