An counterintuitive idea: if you want to live comfortably, you should "say but not necessarily follow through," rather than always keeping your promises. If you have promised something and feel that you are at a disadvantage, you can choose not to fulfill your promise, and you shouldn't feel any guilt about it or apologize to anyone. This is the well-known "consistency trap" in psychology. Don't keep making the same mistake on wrong promises. The only constant in this world is change; no one can always follow through on their words.