For someone who doesn't want to be "labeled" or "stereotyped" you really, really want to be known as "gay". Isn't that a label? I know you're going to say it's who you really are, tired of hiding, etc, but why is it important to you for others to know you identify as gay? Do you have to have identification proving you are gay to participate in gay events? IMO no announcement is necessary. Just go participate! Celebrate! You don't have to tell anyone anything.

My main concern would be your kids. IMO even tho they probably don't understand sexuality yet, surely they have opinions, either good or bad about homosexuality. It would be a subtle change in their world and probably disturbing to them, even though you are the same person. I wouldn't discuss it with the kids. Under normal circumstances parents don't discuss their sex life with their kids either.

You do have a right to be happy in your own skin, but please consider your kids happiness and security first.