So I am not first handedly giving you advice.
But, I can imagine from what I observe and feel.
You should first accept it, and embrace it.
Do not try to deny it and try to change it, you are who you are. Embrace your characteristics, not try to destroy them.
Secondly, build up self confidence and be happy with yourself. Not vital, but it definetly helps I would imagine.
When you want to tell, tell people who you want to know, close friends and family. People over fret and tend to keep hiding it. You cannot control or change it. So live and love it. You must understand it isn't some kind of choice. You're born this way.
Don't over fret what others think. Everybody will be insulted and such. But do not pay heed to it. The only opinions that matter in the end are those of loved ones. Not people who merely want to put you down, and I doubt loved ones want to do that.
Just trying to say, love it and yourself.