1. You become a negative person
When you complain all the time, you begin to see the negative side of everything.
Even if you don’t believe in the Law of Attraction, there is some basic cause-and-effect going on here.
2. You believe things are worse than they really are
When you complain all the time, you see the world through negative goggles.
Everything will seem worse than it really is because you’re actually seeking out the negative.
3. It becomes a habit
Bad habits can be especially difficult to get rid of and when you complain all the time, it becomes a habit that will be difficult to break. (Still, it is possible to break it once you are aware.)