Disappointment has a lot to do with trying to find contentment or purpose in the wrong things... then even if we accomplish those things, there is no lasting fulfillment in them... So the answer for the follower of Christ is seeking God's will for our life. Here is where real contentment comes!
When we become a Christian, God rewrites our spiritual DNA... now contentment comes in the form of hunting for purpose, grasping revelation, and an appetite for the impossible becoming possible by faith!
Whatever has been the norm in the past, must now be redefined by God's supernatural standard of "normal"!
"Seek first the kingdom of God and His righteousness; and all these other things will be added..."Matthew 6:33
This scripture should be the "NORMAL" experience for all Christ followers, and when it is, I believe we will experience less disappointment and more fulfillment... What say you?