If you've lived with critisism and negativity that could be why you are seeking validation to prove someone wrong? It has to come from within. Every success leads to another desire for more success and validation. I think we need to accept ourselves,, right now as we are. There may never be another tomorrow. Count your blessings right now. Think of just one thing you are grateful for, it may lead you to yet another. Then you won't need that outside source of contentment with acheivements. Love yourself right now and forgive yourself for whatever you feel down on yourself about. If this doesn't help, keep posting. There are many good people here who may have a better answer!