When you are unsure of yourself, you may take every little thing someone says to you or about you as some sort of disapproval, even when it's not. When you don't feel good about yourself, every little criticism from anyone else will shake and affect your confidence.
But when you genuinely like yourself as you are, and when you are satisfied with you just as you are, it won't matter much to you whether others like you or dislike you.
If you are in strong, solid standing with yourself, others can’t shake you. You won’t have to find your self-esteem and self-confidence in anyone but yourself. Hold yourself high at all times.