We studied about David and Goliath last night in VBS. There are a number of lessons that are obvious from this encounter--the power of God and the importance of faith in God, that should be applied to daily life.
Another lesson is that we don't have to fight our Goliaths alone. Yes, we all have at least one Goliath, a giant problem we face, oftentimes over the long term. Oftentimes, we try to deal with our problems by ourselves, at least until it becomes obvious that we can't. The apostle Paul asked the Lord 3 times to take away his thorn in the flesh, but was told that "My grace is sufficient for you". Paul's conclusion from that was, "When I am weak, then am I strong", because when God is on our side, the victory is assured.
Instead of trying to face your problems alone, lean on God for help. He may work things out in ways you never thought of or it may be simply that His people jump in and help resolve the problem. Either way, you win.