Please make this one resolution. Exist in photographs. Don't hide, don't wait until your hair is better, until you've lost weight, until you're ready. Just live. Be photographed. Someday, that printed (please print those pictures too!) image will be the only thing your loved ones will have. Let them have more than a memory.
You are beautiful, you are loved, you deserve to exist both now and in photographs. And when you are someday gone, those images will be more precious than anything else to the people who loved you.