For me, thinking negative or frightening things that "should" be verifiable or not (whether there are cameras all over the house) but that I don't/can't verify, is paranoia on my part. I try not to be judgmental of myself but think of it as having an overactive imagination for whatever reason. I've decided there were footprints in the snow under my windows at night (it was snow melting and falling off the roof), just generally "jumped to conclusions" without checking things out. The important thing for me to remember is to always check things out; identify and do "reality testing" on all my assumptions. Having a "feeling" that something is a certain way without obvious evidence that it is true sets off my alarm bells to check things out. I often use "logic" to calm myself if I can't get the feeling to go away. The likelihood of your parents' home having cameras "all over" just to keep track of you and that you wouldn't know about it or be able to see them is not very high?

The other things you mentioned, like having to do certain things, follow certain "rituals" (watch certain movies or talk to certain people at a certain time) sounds OCD-like to me?