I am a proud introvert.

People mistake us for being antisocial or depressed when all we really need is relaxing or personal time.

Also,we can take crowds.A lot of people just stress us out,and we do have a few select friends we can hang out with,and not let our introvercy get in the way.At least,that's how I am.

Not sure if there's an official classification for it, nor have I been "diagnosed" as such, but I think that my social behavior could be described as "Selective/Asynchronous Introversion."
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It feels like I can be "normally" sociable in some situations, downright outgoing and verbose at times... in most others, I clam right the hell up. No, leave me alone, I'm not interested... leave me the hell alone.
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I'm starting to have trouble finding those places to open up.

@Smitty, I've never been able to put that into words before. I feel like this describes me as well. Thank you. =)