Troubled thoughts family problems?

I've been thinking. My moms side of the family is white and I mean all of them but me and my siblings are puerto rican because my dad was. When ever we have family get togethers me my mom and my siblings are like out casts the only people who ever talk to us ar my grandparents and aunt and uncle. But on my dads side the people I know are aunt and cousin. I don't understant why a family would cast out other members for race I mean I broke my cousin's boyfriends nose for calling me a dirty spick. I don't know what to I isolate myself from entire family and I'm only just turning 15