I hate having read receipts on in any of the apps that I have on my iphone
Are you hoping your friends will trust you enough to not have read receipts.
No, I don't want my parents to catch me.
Sometimes we nitpick a little now and then, but what is the big deal if your parents catch you? I think your parents should know what you do if you still live with them. Never hide anything from them, it will make them very cross to find out later.
They are not my real parents they are actually my guardians and they don't need to care what I'm doing when I am on my iphone.
You should not hide things from your parents or guardians. They are just concerned about your safety.