Elaborating on halfway: when my "job" was "be social and go to class all day" and my leisure time was "hang around suburbs with the same crew of friends," I needed a lot of alone time to recharge and I'd be miserable going out.
Now that my job is "write code all day" and my leisure time is "read books and work on music," I feel a heavy need to socialize, and I often enjoy going out.
Just like many things, it's a spectrum, and everyone falls somewhere.