There are many, many people that live unhappy lives. They are unhappy with their work or their family or the choices they made yesterday or choices they made years ago. Co-workers or kids acting up can be a drain on the life they might be living.
Nothing is going to be the same as it was. People and situations will change whether you do something or do nothing at all.
Enjoying the good things in your life now is a good thing . . because nothing lasts.
Letting go of the stressful things now is a good thing . . . because nothing lasts.
Doing the right thing while you have the change is a good thing . . because nothing lasts.
Making today a good day, right here, right now is the best thing.