Far too many people, that really ought to know better, get unduly frustrated over all sorts of things, mainly because they do not have the power to change specific things of seeming importance to them to their own willful demands, fair or foul. The bottom line is that those that demand that things always go their way, or that things should go their way, are often going to lead lives of frustration because that which they have not created, will never bend to their will, and there is nothing that will ever occur for them to change that.
A far more mature way of looking at the world is the recognition that this world is filled with not only its own natural laws that are applicable to everyone, but that different people from different backgrounds and with different priorities are not all going to be on the same page with just one particular person that they must adhere to, and that too is not going to change. Rather, it would behoove a given frustrated individual to recognize that everyone is entitled to their own thoughts, their own freedom, and their own liberty, and that thereby the world will consequently have its ebbs and flows, of which, those of strong constitutions and sound principles, are able to adjust as needed to those circumstances as they are -- in which, of even more importance, all those of superior insight and vision, are able to effect influence upon such, and to the degree that they do, this helps to make the world a better place, not because they are somehow successful in bending the world to their demands, but instead because they are in harmony with justice, goodness and fairness.
Again, the mistake in mankind's nature is often to get overly frustrated about those things and circumstances that are not going their way, believing at that time, at least, that those things and circumstances should and must go their way, and the more that they believe such, the more that they frustrate themselves for their subsequent failure to effect those very things not occurring as desired. So that, for those that are unable to discern the difference between that which is subject to change, and thereby amendable to change for the better, as opposed to those things that cannot change, or that we do not have the influence to change, then because they are unable to differentiate such correctly, this will lead them to being constantly susceptible to a great deal of childish frustration.
In short, far too many people spend far too much time, demanding or wishing for things to go their way, rightly or wrongly; whereas, in truth, a better construct would be to desire and to thereby contribute to helping to bring to fruition a world in which every action and interaction thereof was fair. A mindset such as that, would do wonders in reducing people's frustration, because instead of being solely focused on what they personally want or demand or desire, they would be concentrating instead upon doing their part in contributing to the betterment of all people -- of which those people are after all, equally entitled to those unalienable rights so granted to each one of us, by our Creator.