Yes, I can imagine how difficult it is, because you just don't know in advance how people would react.
My 5 gay and lesbian friends told their families and close friends about their sexual orientation when they were between 20 and 30 years old. Before that, they felt too afraid. Fortunately all of them experienced good reactions from those people (well, some parents were first shocked, but then accepted it without big dramas). With this "support", they are now more relaxed about it.
But to be honest, I've also heard very rude discussions about homosexuality among teenagers on the bus, which really freaked me out. It led that far, that some adults told them to stop it, which resulted in verbal fights.
I think it's also a question where you live - the tolerance can be different in different cultural settings. And of course it also depends on the attitude of your family and friends. You can't choose your family, but true friends will accept you whether you are straight or homosexual, big or small, slim or fat. I wish you that your friends and family will be very tolerant, whenever you decide it's time to let them know
