If God told us that we are obligated to help humanity, to work together and to love one another, that means it can be done. God is not a sadist. If it couldn't be done, He would not have told us to do so. That's why Judaism says that frustration and anger is the equivalent of idol worship. Life has no problems, only opportunities.
Quitters never win, and winners never quit.
Losing your temper means you're a quitter. When you quit because of frustration, you lose credibility and self-confidence. Life is difficult and the path to greatness is paved with frustration. You can't get to heaven on roller skates. When we know that God provides the challenge, then we know we can succeed.