Complaining is found in most of people life, we complian our grieves, circumstances, etc.. As Christians we need to taking example of Christ in our situation, his sufferings which he took cross for our sin even unto his death without complain.
Is God pleases with our complains about circumstances?
Looking into Old Testament, Israel also complained too much even after God showing his mercy to his chosen people by taking out from slavery.
[bible trans=’kjv’]Numbers 11:1[/bible] 1 And when the people complained, it displeased the Lord: and the Lord heard it; and his anger was kindled; and the fire of the Lord burnt among them, and consumed them that were in the uttermost parts of the camp. Concern is event though we were not be burnt in fire literally as Isralites but still be subjectable to lord for displeasing him by defiling his word and HolySpirit which is dwelling in us (belivers).
We complain because we expect too much within us (things viewed and driven from own self desire). We expect to fill our carnality and by failing we express our displeaseness to other.
Paul declares in, [bible trans=’kjv’]Philippians 2:13-14[/bible], For it is God which worketh in you both to will and to do of his good pleasure. Do all things without murmurings and disputings. These energising scriptures has more to do with God’s enablement than with our resources. HolySpirit that dwells in belivers enables to build holy life which is pleasing to God and cooperation unto him produces a transformation in our conduct that is essential in maintaining a good testimony in the world.