Renita no my parents haven't mentioned anything about controlling my devices. I got my own phone like by 16, even then i could set my own password and I was the first person to unbox the phone at the store. Now I have one I brought with my money, and I pay the carrier fees so I'm sure there isn't anything like that on this phone. My sister uses my old phone, it's better to not talk about her browsing habits.
I didn't tell them ofcourse but I'm sure they know that I watched porn. I was always careful (and still am when I read light erotica) to make sure to not leave traces behind.
Not quite sure if you understood the term "booting of a external device". Is the parental control on the windows operating system or on a bios level? If it's on the OS level, I'm sure you should be able to boot a different OS. I'm not sure if you are from a tech background, if the terms don't make sense, feel free to ask.