To often we feel ourselves bad because of something... We can be poor, ill or someone could tell us something bad. In all that cases stress or depression come.
How to improve your mood in a fast safe and most convenient way? Without drugs?
Do something for someone other. Give a coin to homeless. Serve some disabled person. Say compliment to old person. Make someone happy. See his smile. That will make you happy. And despite on all your problems your mood will be improved.