What to do with parents?

okay so sometimes i feel my life is really not worth it im 15 i have many responsibalitys and i feel mature compared to some other teens my age. i am never allowed out wich is one of my major problems. i cant go out to the corner of the street with out their permission i cant have ANY privacy i am not exagerating i cant have my facebook or anything with out them asking for my password and reading my messages they wont let me upload pictures at least one and my mom thinks its okay for me to shower or change with the door open when my dad is not there i personally think i need space i have talked this over a million times with them they say no privacy till im 18 and even if i were 40 and living with them i need to fallow everything they say.i cant speak to boys because they will automatically think i have a boyfriend wich im not allowed to. she always checks on my friends {that are girls} she goes to school and tries to find out if they are bad students or anything i always do work around the house i have fair grades not perfect but okay and im not bad i do get rebelious sometimes but its only because i have no way out i know they love me and they dont want me to get hurt but i need space as i said before i want to take my own decisons not let them do it for me i have talked they dont care what should i do?