It's time for a quick pep talk! 

You are in charge of who you let into your life.  Just because someone is a blood relative does not give them the right to be in your life.  They must EARN the right to be in your life, to have access to you.  Do they inspire, support, encourage, and uplift you?  Or, do they just make you feel badly about yourself, physically hurt you, put you down, or yell at you often?  Are they harsh, judgmental, and critical?