"Whatever a person frequently thinks and reflects on, that will become the inclination of their mind."—Buddha
Whatever we regularly think colors our experience—all day, every day. Once we start to watch these thoughts, we discover that 90% of them are reruns! Others are about problems, some are about our preferences, and many are self-evaluation.
"I've lived a life full of terrible misfortune - some of which actually happened to me." Mark Twain or Samuel Clemens
Our life is shaped and determined by our thoughts. Usually we are only half-conscious of the way thoughts direct our life; we are lost in thoughts as if they are reality. We take our own mental creations quite seriously, endorsing them without reservation.
This is old stuff but I can't remember it enough. One of my daily affirmations is to think positive thoughts. I have from time to time kept an Anxiety List where I detail the worries of the day - then from time to time I review these worries. To quote Mark Twain: "What a heap of horseshit." It's very, very difficult for me to dwell on the positive. My mind tends to the defect, to the possibility of the defect.
I think this is a defect.