How socially-derived are emotions?

[Cavernio]

Lots of emotions are socially derived, this is probably not a new thought anyone has had, and is possibly something you've studied. There are the obvious ones, like jealousy, envy their opposites like narcissism, etc.
But what about more basic ones, like happiness, sadness, love (supposed to love yourself, right?), etc? What causes happiness, sadness, love? Can we even have those base emotions being sequestered from other people physically and mentally? (ie: not thinking about other people.)
How much do we need to compare or have other people around us, in order to emotionally experience things?
What emotions do people like hermits experience?

I dunno, pretty standard question, seems pretty standard for answers too, but sometimes I wonder more about it, I wonder just how ingrained even base things, even base experiences that seem to relate only to me, at some point required other people around. An example of a base experience that to me seems unrelated to other people is something like, solving something or figuring out something. That experience is satisfying to me, and seems at first glance completely unrelated to anyone else. But is that actually true? And even if it is true, would that sort of satisfaction be enough for me to bother existing? Does it matter that perhaps these emotions are so ingrained with socialness because we've all had social interaction as infants and young children in order to be alive? I know that infants that are severely neglected end up being retarded, but is that because of a lack of interaction and doing things, or because of a lack of emotional interaction means there's not enough motivation for the infant to learn things for itself? Like, if we were to put human infants in, for lack of a better word, puzzle boxes and feed them etc, but made sure to not give them praise or scolding, would they still be retarded?