My parents are driving me nuts!! HELP!!?

i am going to go to college soon and my parents still are holding the reins too tight. I feel like they are going to control me my whole life and i do not know what to do about it. if i go to a friends house to much they yell at me or if i have people over they yell at me while my little brother has his friends over every day all the time. my mom saw i was looking for a tattoo online and basically yelled at me saying i need to talk to her before i get it. i am 18 now and am so frustrated that i feel like running away sometimes. i don't talk to this about anyone except my sister because she knows how i feel. my mom doesnt let me do anything and it really bothers me. she is not going to be there when i go to college so i think she should let me go already. she is causing me to rebel. what to do. i honestly cant handle this anymore. this is seriously stressing me out i dont sleep or eat anymore. i am an indian girl and used to be fun and healthy looking. i used to weigh 112 but this stress has made me loose weight and now i am at 101. my parents dont think its a big deal but i have no idea what to do. for sleeping i tried everything i could do but nothing helps. i really need help it would be greatly appreciated.