Feeling Mad and Confused

I feel so mad at everything. In the moment I'm like: "it's whatever" . But then later I think about it over and over and over until it makes me think I'm mad about it, I get very mad about what happened in that moment and I try hard to convince myself to see it for the better but it doesn't work. At the end of the day before shutting of the lights I'm like: "I don't care, it is what it is. It happened" . I have a feeling I want to not care all the time but I need to feel something and I feel as if I'm wrong.