Exhausting thoughts

In high school a friend said to me, "You think too much!" and essentially that has been the bane of my existence. I go around and around with thoughts especially with decisions that are not black and white. I have complete arguments with my husband in my head and let emotions from what I think he would say upset me. Actually I clam up and rarely confront him which is another story in itself. It is very hard for me to keep positive. Ruminating so much is exhausting. I would like to quit being so analytical and feel what it is like to be happy and have fun.