Does he like living there? I might ask that. Men & women communicate differently; women tend to want way more than men IMHO. MofCS said something that struck me, is he an engineer? There could simply be a difference in wiring that means you require more (your major is psych, right?) & he less.
He is a roomy not anything more it seems. If he pays his portion and can be social on his terms, is not mean or in other ways intolerable ... I guess I wouldn't look to him to be more than that. I don't think he signed up to be your pal.
It sounds like the harder you try, the more he withdraws. Don't feel uncomfortable in your own home, but do adjust your expectations of this roommate & see if you can find a peaceful place in this.
Best to you ~