Nehemiah 8:10 The joy of the Lord is your strength.
The key is to realize you are here to serve Christ, not yourself. God does not promise us an easy life, free of troubles, trials, difficulties, and temptations. He never promises that life will be perfect. He does not call His children to a playground, but to a battleground. In the midst of it all, when we serve Christ, we truly discover that "the joy of the Lord is (our)strength."