There are always things that don't go the way you imagined them. But how does this become a problem that takes away your lightheartedness?
A problem lives from a difference between where you think you are (is) and where you want to be or think you should be (should). But that is not enough. Besides, you have repeatedly failed to get there and you have no idea what else to try. Besides, you can't get out of it either. Now you have a problem.
The person who has the problem is often not fully aware of the elements that lead to the problem.
Another person, under the same circumstances, may not have a problem at all because they perceive and/or evaluate the same things differently. And although this is the case, the problem can be very serious and burdensome for you.