Cliche, Rushes?

You know that feeling of everything in life, the situations, the people, everything is just a cliche?
I don't know how to describe it, maybe someone is experiencing the same and can give me an explanation about that feeling. Is this Depersonalization?

Second question, I often feel like a shitbag, not cause i hate myself or #######4, cause i was raised that way. I have often problems looking people eye to eye starting a conversation, but sometimes i have this rush, where I feel "that's the time" I can now walk over and do to that people whatever I want, until "the time" is over. Maybe it's just a manic rush, but this always comes with violent purposes.