invasion of privacy? PLEASE HELP!!?

[Sydney]

ok so im 15 and i live with my stepmom and dad, my dad basically trusts everything i do and never was into my buisness. I've lived with my stepmom and dad for about 4 years now. My stepmom goes through my drawers, monitors the numbers of people and the time i texted them, monitors the music i have on my ipod, tracks my phone, goes through my entire phone when she takes it away(usually finds a reason to take it away because she always assumes im up to something), and i recently made a new group of friends and she made me write down all their names and looked them up on facebook and twitter. She saw some pics of them drinking and what not. So now i cant hangout with any of my new friends(they are not bad kids, i promise). Also whenever i go places she needs to talk to the parents and know the address of where im going, otherwise she will track my phone. Is this an invasion of privacy?..........is it really neccessay to do all this?

Also when she does this my dad and her fight and argue very badly because my dad thinks i need privacy....she continues to do this anyways. She also gives me teriible anxiety because im always so afraid she is going to find something bad of mine. (i really have nothing to hide but ocasionally she will catch me doing something, nothing even bad) This causes huge problems between my relationship with my dad and her. I NEVER TALK TO ANYTHING ABOUT THEM, BECUASE THEY WIL JUDGE ME HARD!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!