The Bible gives us permission to complain--moreover, to complain to God. After all, 1/3 of the psalms can be classified as laments (a politer word than complaints).
This lament from Jeremiah is an example. Jeremiah expresses his realization that he is under threat, that he is like a lamb being led to slaughter, that he has been plotted againt.
He is complaining to God, and he is asking God to make things right.
Jeremiah felt abandoned. Jeremiah turned to God for help.