"Constructive complaint requires only two things: that what you are complaining about should be different, and that it can be different. It sounds simple, but too often our protests fail this test." Julian Baggini
TIP - the irony of being happy is having less (to worry about). If part of your complaining is feeling like you don't have enough time, take tasks off your to-do list, see if you can survive without them, and observe your state of mind thereafter.