We should be building ourselves up everyday, telling ourselves how amazing we are. Eliminate bad habits and replace them with good ones. Telling yourself positive affirmations every day, especially on days where your just not feeling it, will lift you up and overtime you will become those, even if you don't believe it at first, stick with it.
Fake it until you make it.
Spread kind words to others, tell someone there doing a great job. When we judge others were judging ourselves. Its always a reflection. I believe in the boomerang effect. What we say to others comes back to us. You can make someone's day, week or even month by being kind and giving them a compliment. Always be kind!