Here is how I look at it: Think of your childhood and teenage years as preparation for what you are being called to do. It works the other way, too. If you are going through a difficult time, think of it as preparation for your calling, whatever it may be. God has a reason for everything, just let him carry you.
"Cast your cares on the Lord and he will sustain you; he will never let the righteousness be shaken." Psalm 55:22