Why do some people "come out of the closet" and some stay in it?

I was reading an article about a certain film star coming out of the closet. It got me thinking simply because she said she felt like her own jailer when she was hiding the fact that she was gay. . In different areas of our lives we may decide not to divulge certain information about ourselves or we may. What actual benefits are there to coming out and telling the world something different about yourself that they did not know before? In which ways does it change ones life? Have you ever done something like that? And how did it change your life. Or are you of the opinion that “it is no bodies business” and don’t seek out side validation?

Some examples, I am bisexual so in a way it makes me a bit of fence sitter. Plus I reckon we get more rap than gay people because of misunderstandings. Also my mental illness, I never really feel up to explaining a whole lot to people I tell. But in a way are we all not responsible then for general ignorance if we do not share with other people?