firstly, I've come out of the closet to two of my friends, You need to choose the person you tell first carefully, that friend who won't judge you or laugh or tell everyone else. Once they know, tell a few other close friends, then tell more close friends. Once you're comfortable enough to tell your parents/guardians, sit them down and just tell them. They'll be fine with it. It may seem a bit strange at first, but trust me. They love you, and your sexual orientation won't change a thing. Unless you have a homophobic mother like me, you'll be fine:]
hope I helped :D