Good for you. You will feel better & be happier about life with the more people you open up with. I bet almost all will accept you & I bet they will help you with life more than you think.
One of my best friends is a woman that I went to grammar school with. She is so happy about my life & we are very close friends. She always knew I was female all through school anyway however I did not or could not be open back in those days. She looks forward to the day I can really become her sister & good friend for life.
Your friends will support & love you. If some are not supportive that's OK, you will know they were not your real friends anyway.
Good luck GF.