Facebook privacy help.?

[OddDude21]

I have set my Facebook privacy so that only friends can view anything on my profile. but, still my parents keep watching my account and can see what im doing. and im not friends with them. It makes me mad that they dont trust me and dont respect my privacy. i have not given them any reasons to not trust me. is there any way to guarantee that they cannot see my profile. I'm sick of getting told "you shouldnt "like" that and being scolded every time i "like" something on facebook. I have resorted to an alternate account under a false name but its a lot of work if i want to keep switching back and forth from that to my original.
I do have it set to FRIENDS ONLY. And I do know i can block them but i dont want to get chewed out for blocking them.

I WANT TO KNOW IF THERE IS A WAY TO MAKE IT SO THEY CANNOT SEE MY ACCOUNT AT ALL. OR AT LEAST NOT SEE ANY INFO. SETTING IT TO FRIENDS ONLY ISNT WORKING CUZ MY MOTHER KEEPS YELLING AT ME FOR "LIKING" STUFF.