We all do...
Then quit complaining!
Because the more you complain the more negative energy you create around yourself.
Sometimes we have to accept 'Qadr-Allah' and we have to be proactive in looking for an alternative solution.
Take any situation you're in - if it hasn't worked just accept its Qadr-Allah and focus on how to move forward.
Because if we allow ourselves to wallow in complaints then we'll never see the next opportunity.
After all we do ask Allah to bless us with good and keep bad away - then why complain?
Its ok to have a bit of a 'pitty-party' to let the emotions out, but don't allow yourself to drown in it - instead be ready to swim to new opportunities insha'Allah.
As some wise person once-upon-a-time said; 'When one door closes in life - another opens!'.
Be focused and alert so you see the next opportunity iA!