i'm only considering a phd now i'm going to live with my partner. I decided against doing one as a single parent as i'd have gone mad with isolation. However, the seductiveness (and so value) of art, writing etc is partly because it is you, alone, with the painting, book etc, and this makes you feel special, the art can work on you in this private space.
So, enjoy being alone with it. But balance (rather than reconcile) it with human company...try meeting people for lunch on a regular basis, share a house (background companionship) etc