Going all in on something that is not in your power to control is wrong and that was your first mistake. No matter how easy your think a game is do not bet with total assurance that it will go certain way. Place easy bets that will not kill you if it goes bad for your position. Another thing, there are no minors in football. We all underrated Saudi Arabia against Argentina but that is football for you. We all learnt our lessons.
This is probably what we need to learn from this experience, I know there are some matches which seem to be so one-sided that we think it is impossible for one team to beat the other one, however everything can happen in sports, that is why we watch them, as it is incredibly satisfying to watch a team that supposedly had no chance beat another team that is way better than them.
And if the OP had made a small bet on this match then his losses will be meaningless, but since he decided to bet everything and lost it is natural to be mad about it, but at the end it was the management of his capital what got him in this problem and not betting on this particular match.