It could be better

Dear Brooke,
In almost every aspect of my life (eg career, marriage, family, appearance) I have a thought “it could/should be so much better than this”. This is motivating & keeps me striving. However I’m realising it leads me to constantly reject my current reality so that I feel dissatisfied and keep trying to change the C. This thought also creates a feeling of failure. So I’m beginning to think it’s a poisonous thought that appears useful. Can you help me with how to drop the dissatisfaction but retain the motivation? Is there a good way to tell if I’m working towards achieving a healthy R vs attempting to change a C? Thanks so much.