Like I said, you can make that argument, but then you need to provide a criterion for saying someone is unhappy. That's where behavioralism or functionalism or something similar comes in.

> Your statements seem to assume everyone has the same perspective to measure against, but in reality people's perspective can be radically different

On the contrary, I think people have different perspectives. Two people can be in the exact same situation and their subjective feelings can be radically different.