I know how hard that realization can be, as I personally freaked out at first. I remember even saying that word while looking into the mirror was almost impossible, breaking me down into tears so hard as if I have never cried before. This was just about 2.5 years ago, and now here I am, proudly embracing it, doing my best to help people who is struggling with it.
First of all, yay! You are brave and open enough to come out to yourself, to admit it, and it is one of the biggest steps forward. Next step? Embrace it! Love yourself! This is what to do.
Coming out is another step, and it is definitely up to you, as you should not rush coming out. First develop love for yourself, as it is what matters the most. Do no just “accept” it but embrace it. It is just a part of you, not something to describe you totally. I know this may sound like I am repeating myself but I am just trying to emphasize its importance.
You may also want to talk about it, then contact local LGBT organizations or GSA at your school if available. When ready, share it with people you love, you trust, as their support will also make you feel better.
I hope this helps and please do not hesitate to ask more if you need to.
P.S. I know how scary it can be, as I was freaking out at first. What helped the most was just asking myself “what do I want?”, “how do I feel?”, and keeping a journal to write down all, to release all the pressure I had. I also remember watching videos from It Gets Better helped me a lot, making me realize there is nothing wrong about it.