How many times have you had a negative thought about something that may or may not happen? It is important that you understand that these thoughts often arise out of your fear of the unknown and so you must question these thoughts before you believe them. Generally the cases of them coming true will be very low. A thought is harmless unless you believe in it. It is not the thought but the attachment to it that often leads to our suffering. When we get attached to a thought, we start believing it is true even before verifying its authenticity. Negative thoughts often arise due to the fear of the unknown and carry no evidence of being real because they have not even occurred as yet. They are a natural response from your brain to alert you from all the upcoming challenges. The only purpose of these thoughts is to act as a reminder and prepare you to be aware.
We come from a survival and scarcity based culture that we simply cannot conceive the bigger possibilities of life that lie ahead of us. Nurturing a mindset of abundance is absolutely essential for your general well being and growth. So be happy and live life king-size. Hope for the best and get ready to face the worst!