Live alone if you can afford it, especially if you are extroverted.
When you're at home, do work. If you want to take a break, invite someone over to watch a movie or something. If you have a roommate around, and you're an extrovert by nature, you'll be tempted to talk and hang out, especially if you end up friends with your roommate.
There's also the possibility that you'll get some horrible freak, which is definitely a possibility if you don't know the person (actually, its possible even when you do know the person...). Such a situation isn't fun to deal with in regular life, let alone duing 1L.