I don't have any freedom for my future, HELP.?

i'm only 12 years old but i still am really worried about my future. my parents already hve a set future for me, that i HATE so much. they want me to be a doctor when i grow up, and honestly, i'm not even that smart, i HATE science, i cant dissect a dead body, im to scared to even go to a CEMETERY. i like art, singing, dancing, acting, designing, and soccer. and when i made a joke about wanting to become an actress my dad went MENTAL. honestly. i have two older sisters,and they want ALL of us to be doctors. they stress us out, and i've seen what they do to my 20 year old sister. they ignored her for a good 8 months, just because she said she wanted to be a dentist. my mom is understanding, but i could feel the dissapointment that she has. and my dad, oh god i cant even TALK to him without him yelling in my face about how he f***ing can't wait to see me wash toilets on the street (he's being sarcastic). and when i tell him, just because i dont want to be a doctor, doesnt mean i won't earn anything...he gets REALLY pissed off. i'm just so confused and i dont want to be a doctor and i dont want to have a set life. we can't date, we can't hang out with guys, we cant marry who we want. i dont care about that but the fact that my dream of becoming a singer is just as realistic as me wanting to be a doctor when i grow up, makes me want to cry. i love my parents to death, they do so much for us. and i don't want to dissapoint them or i dont want them to ignore me the rest of my life. and if i "make my own decision", then they won't pay for my college probably or ever look at me again.