Let X be - a "situation", "circumstances", "state of affairs" or anything else in the world "out there".
Let Y be - the way you'd like X to be.
Let Z be the delta. The perceived relationship between X and Y and the resulting delta IS the problem.
In other words...
A "problem" is your emotional response to what you imagine (rightly or wrongly) to be "out there".
It's a discrepancy between your perceptions as to X and Y.
(The way things are, and the way you'd like them to be)
Another thing about problems is that the source of these "problems" is ALWAYS current.
They are NEVER things that happened in the past. This is because the "problem" is Z, your measurement.
What can you do?
You can remeasure X. Perhaps your measurements were incorrect.
You can change Y, your expectations as to what X ought be.
You can try to make X conform to Y.
You will likely do all three, but in all this you should remember that the "problem" is Z - you and your expectations/measurements as to X.
You do have control.
Don't be a victim, because you are not.