“An entire sea of water can’t sink a ship unless it gets inside the ship. Similarly, the negativity of the world can’t put you down unless you allow it to get inside you.”
Worry doesn't do anything for you. So why worry? Seriously if you think about it you may not even get to see tomorrow so why worry about it? Forget about the past, don't worry about tomorrow. Just live in the present because there is a lot going on.