Why is my mother mad at me?

are family situation rite now is REALLY hard! yesturday i got really pissed about alott of things and i told her i wanted to live with my dad and i hated her..i havent seen my dad in almost 6 years he lives in cali and now im moving out there,....my house rite now is TINY no room at all and i have alot of sisters my life sucks here my mom doesnt do anything for us its a LONG story..like she cuts herself and it makes me really depressed and theres only so much a person can take u kno? i think shes mad at me cause im leaving her? maybe she thinks i dont love her anymore and im choosing my dad over her?. please help me thnk u so much! :)