Word to define person with bad social skills

Doing some reaserch over the net, I think I've found what I was looking for.

I believe the term social outcast would be the most appropriate word to describe what I asked previously, so I'm adding my own answer here.

I'm quoting here a piece of definition that is not very "formal", which doesn't come from a dictionary but rather from "urbandictionary.com":

A loner or social outcast is a person rejected by their peers because they are different, strange, inept or misunderstood. They are ostracized, shunned, avoided, excluded, and generally unwelcome. They are victims of bullying, character assassins and scapegoats.

If the society into which this inept person fails to fit in is polite or decent or cultivated society, one could call him (or, perhaps less likely, her) a boor. But often the society that people try and clumsily fail to fit into is anything but those things, in which case the term would be decidedly less apt.

Avoidant personality disorder. It is more than social awkwardness or an inability to learn social skills. It draws upon a severe phobia of failure/anxiety in interacting with others.

Boor is totally inaccurate as a boor is usually self absorbed in their own interests. Socially inept is extremely close but represents an ability to learn social skills at some point.

Avoidant personality disorder is nearly impossible to overcome. It represents extreme feelings of anxiety in just thinking about interacting with strangers on a social level. Most suffering from this disorder can still interact with people in a work setting. This is the norm as well for those considered as nerds, etc. In this type of setting, Sufferers can rely on intelligence to guide their words to solve problems or interact peers. In a social setting, however; the anxiety sets in, sufferers feel uncomfortable and withdraw.

Has anybody thought of introversion? Being an introvert is perfectly normal and is not a disorder in any way, to call it a "disorder" would be a bit discriminatory of introverts. Not everyone has perfect social skills and not everyone wants to talk to lots of people.