Do I have a right to privacy in this situation?

[Katpiss Neverclean]

My mom is forcing me to give her the password to my twitter, facebook, tumblr, itunes, and youtube. I do post some swearing sometimes but it's not a huge deal. She goes through my itunes often and gets mad at me and forces me to delete songs. Now shes asking me for the password to my laptop, and she says she "trusts" me. I refused to give her the passwords and I told her that I have a right to privacy and she said "PRIVACY DOES NOT EXIST FOR 15 YEAR OLDS. PRIVACY MY ASS YOU DONT HAVE ANY, I AM YOUR MOTHER, YOU BETTER GIVE ME YOUR PASSWORD."

Do I have a right to privacy? Because sometimes I vent on my tumblr about things I'd rather her not know about. Last time my friend and I got in a fight, she messaged all people involved on facebook, called her and her mom, when it wasn't even a big fight and we made up 4 days later.