I'm going to be honest here--I really don't see why the OP is worried about Asperger's. I see social isolation; but there are so many reasons that could happen that to think of AS specifically is kind of a jump. Not that it's impossible, of course; but there are so many other reasons this might be happening. Simple introversion, for one thing, means you're more comfortable alone--and people often see this as pathological even though it's nowhere near. Depression and social anxiety could easily account for all of this...

The major issues in Asperger's are generally some combination of problems with understanding other people's verbal and non-verbal communication, with communicating with other people (a low skill level, not hindrance due to anxiety) and having conversations; also repetitive movement, extreme fascination with a favorite hobby (which can be very narrow or very intense or both), and often sensory problems like overload or under-sensitivity. It's also common to have problems switching tasks, making decisions, and planning things (this is similar to what's found in ADHD, actually, and I think the two conditions are somewhat related).

I think you need more specific information, really, before you figure out whether this is something to consider. You could probably mention it to your doctor if you wanted, I guess.

BTW: I'm not normal, and I'm proud of it. Normal is boring, hon. Seriously. I think you would be happier if you decided to be the best YOU that you could be, the person you were meant to be, rather than "normal".