Opinions on parents and their children's facebook?

[Deppina]

i recently found out that my mum somehow logged in my Facebook and read my messages. it's not that i have something to hide from her (thank god she doesn't know what's tumblr!), but my messages are my private things and i think she doesn't have any rights to read them, especially without my permission. this already happened few times before when she read my diary!
and she never apologizes or anything she just says that she has every right to know what i'm doing and that parents should have all their kids' passwords because ''internet's a scary place full of people who want to hurt you''.
ok, i'd understand her concern if i was chatting with a possibly-pedophile person, but those were friends from my school and she just casually read everything.
it's not that i'm not telling her stuff about me, i do. she thinks that what's she doing right. and now dad agrees with her.
so parents, people, anyone... what do you think?
i'll later let her read your answers and i hope i'll win ok bye
i'm 15 btw.
and my tumblr isn't a nsfw pale thing, it's a fandom blog and people would probably think i'm crazy because nothing has much sense there...