I need to know better

Most people will say I don't talk enough. I don't reveal enough about myself. If you ask me, I say way too much. I need to learn how to be more vague in my answers. I have to stop just blurting things out at people. It doesn't do them, or me any good. It freaks them out, and makes me think about things I'd really rather not think about. I'm having a hard enough time staying in a good mood lately, given how tired I am. Thinking about things that upset me is not really helping.