This may be kind of a broad question, but what helps you stay positive?

Lately, I'm struggling with the feeling that things are so out of my control and not going my way at all. It makes me feel powerless, helpless, anxious, and unworthy, because I feel let down a lot from the things happening around me and by people. It makes me feel like, "What's the point any more?" Everything keeps going wrong. I don't want to rely too much on certain outcomes to make me happy, but I'm not sure where a starting point would be as far as being self-reliant.

When you feel this way, what helps you? Any advice would be helpful right now. I'm also wondering if there's anything in particular I should try to stay away from since I'm in a vulnerable state. I thought my self-esteem was getting better, but I feel myself slipping and don't know what to do about it.