Own, and love, your imperfections.
Always allow time to be silly and loud.
Give a lot of genuine compliments.
Be kind to everyone.
Be happy for other peoples' success.
Always forgive, don't always forget.
Surround yourself with people that make you feel good about yourself.
Don't take yourself too seriously; be able to laugh at yourself.
Know when something/someone isn't good for you and be strong enough to walk away from it.
Believe in what you believe in and don't allow other's to try to change your mind or tell you you're wrong.
Don't compare yourself to others, everybody is so different.
Remember the things in your life that you should be thankful for; food, a place to sleep at night, friends, etc.
I'm sure there a tons and tons more that I haven't thought of, so if you have anything to add, please comment below, I'd really love to hear them!
Here's to a healthy, happy 2015!