Learn to accept and love not just others, but yourself as well since dwelling on past mistakes and, perceived, imperfections leads towards nothing but emptiness so, instead, drop the weight of self-criticism and embrace not only the world of today but the light of tomorrow and you shall receive something that goes beyond words.

TLDR; Accept and forgive yourself so that you can become happier from now on.

Acceptance goes both ways, and in both the darkest or brightest times, your reflection remains.