The SATC lead character said it best. You must not forget to love yourself first. Sometimes, experience is the best teacher. Once we've forgotten to love ourselves and we've reached an ultimate low, someone has to remind us how wonderful we are. We sometimes allow others to define us,  to bring us down. We allow their opinion of us to sway our opinion of ourselves, then doubt and self loathing sets in. STOP! You are awesome!
Now this does not mean to become narcissistic in any way. In my opinion, in order to keep the balance of the universe, you should treat everyone fairly and with the same respect you'd wish to receive. But please DON'T FORGET TO FALL IN LOVE WITH YOURSELF FIRST.

Peace & Love,
K.