That's part of what therapy is for. Learning to internalize a positive voice, or at least to effectively dismiss the negative voices that have been imposed upon you.

There are many of us in the world, growlithing, who believe that simply being a human being crawling around on this planet gives you fundamental worth. I imagine many therapists carry this belief, which informs their commitment to their patients. Be patient with yourself. You will, if you are committed, leave some of the ugliness of your childhood behind. You will get stronger, more positive, more comfortable with yourself. Freeing yourself from your parents, when you are ready, will go a long way toward healing yourself. In the meantime, know that love and goodness truly does abound in this harsh world--and it is yours for the taking, when you are ready to allow it.