Definitely eat healthy food. It's proven that people are happier when they eat healthy (: Also, if you exercise.
If you're lazy and eat junk food, your body becomes depressed, and you may, too.
It's also a good idea to do things that you love and surround yourself with people that you enjoy spending time with. Anyone who stresses you out or makes you unhappy isn't a good influence and shouldn't be in your circle of friends.
For doing things that you love, make sure you do them! If you love drawing - do it. Or, any other hobby. Anything that makes you feel good is a good thing to do to make you feel happy. (:
Also, talking is very good for you mentally and emotionally.
When you're sad or feel hurt, make sure you talk to someone you trust about it. Keeping your emotions bottled up inside is bad and only stresses you out even more.
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