At the end of the day, you are in control of your own happiness. Life is going to happen whether you overthink it, overstress it or not. Just experience life and be happy along the way. You can't control everything in your life, but you can control your happiness.
Just as the Security Council was largely irrelevant to the great struggle of the last half of the twentieth century - freedom against Communism - so too it is largely on the sidelines in our contemporary struggles against international terrorism and the proliferation of weapons of mass destruction.