Too many thoughts

Hm, I've been huddled up in my own little world these few days. Would someone mind telling me how to stop caring about petty things? Oh and note to my thoughts: Please stop. I'm trying to be optimistic but you're not exactly helping with all your negativeness flowing about in my mind. If I ever get depressed, I'm blaming you. Just thought you should know. By the way, thinking is not necessarily always a good thing. In actual fact, thinking too much is a very bad thing.

Sincerely, The overthinker