"Magst du deine nicht?"
How do I know this is "yours" and not "you" At in "Don't you like you (yourself)." And yes that makes very good sense (I work in mental health and it is a frequent question)
Meine = mine, Deine = your, Seine = his ...etc. If it was Don't you like you (yourself)? it would just be dich.... Magst du dich nicht?
Yes, because it needs to be worded in question format, i.e. "Don't you like yours?"
And you can tell that it is a question because the verb is in first position