As you realize your value is intrinsic, positive thinking becomes more accessible.  You learn to look beyond, people, societies, systems and circumstances.  You don't have to worry about whether or not you'll meet someone else's expectations or prove yourself valuable. 

You don't have to try to understand why someone walked out on you, abandoned you, cheated you or, treated you in some other way which causes you to lower your self-worth.  You start out as 'a somebody.'  You're free to build on that as you choose.  You're never a nobody, not even from birth when you set out with a clean slate.

Rather than focus on how far you have yet to travel, places you have yet to see, chapters of your life on the horizon, why not turn that around and pat yourself on the back because of how far you have already come?  No matter what destructive words you've heard, they don't control you.  Ther rejection of other people doesn't have to cause you to reject and dislike who you are.

Consider the story of the transparent glass with water in it. Some people regard it as being half full.  Other people see the glass as half empty.  Still other people wonder about the relevance.  This reminds us that positive thinking begins inside.  You may believe you're far from perfect, but don't fail to realize there are many great things about you as well.  As you identify and recognize them, other people will appreciate you as well.  Positive thinking can rub off. It's a reassuring light of hope.