The 'Ro' method
If you can fix the thing that worries you, then fix it; otherwise do not waste precious time or energy on it.
According to the Ro method, there are only two options for any type of problem life brings about:
a) we can either do something about it, or
b) we cannot.
Once you learn to make this distinction, you will stop fighting to change things that cannot be changed - or do not deserve your limited Time and Energy. Stop over-analysing and complicating things. Things are simple.
The figure and the table below schematically present the Ro method for dealing with ANY type of problem.
For more information, the related form, and practical examples read chapter 8 in Idiots are invincible