To be rejected by someone doesnt mean you should also reject yourself or that you should think of yourself as a lesser person. It doesnt mean that nobody will ever love you anymore. Remember that only ONE person has rejected you at the moment and it only hurt so much because to you that persons opinion symbolized the opinion of the whole world of God.
It is easy to hate and it is difficult to love. This is how the whole scheme of things works. All good things are difficult to achieve and bad things are very easy to get.