Complaining
The problem with complaining is two-fold: you project negativity into the world, and it brings down the people around you. A major part of your happiness if the people you surround yourself with, and people want to be around people they actually like.
If you’re always complaining, you’re sabotaging the chance that people will want to spend time with you (or you’ll only attract people who live for negativity). If you complain less, you’re going to be more desirable to others, and more quality people will want to be spend time with you.
