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Difficulty maintaining eye contact

Often doesn't smile and has blank expressions

Stiff and awkward movements

Liking sameness and routine

Tendency to worry about things more than others

Sensitivity to noise and crowds, etc
I've gone ahead and bolded everything that I have as well. I wouldn't say that it's a psychological disorder though. Whoever thought of this "selective mutism" is just spewing utter BS in my opinion. I have my reasons for these symptoms though. I don't make eye contact in any situation where I'm not looking to be aggressive. I don't smile or show expression because I often have no idea when it would be appropriate to do so (I have a tendency to deviate from 'mannerisms'), stiff and awkward movements are mostly because I'm always tense. I have no idea why. I just am. I like sameness and routine because I prefer to know what I'm going to do before I have to do it and I'd prefer not to get myself into a situation where I'll have to think quickly and perhaps end up ******** up my entire schedule. I also worry about things more than others for the same reason: I like to be prepared. I am "sensitive" to noise and crowds because:
1. I like peace and quiet. That's the reason that I like the Big Island so much and absolutely abhor Oahu.
2. It's so much easier to talk to people when you don't have to worry about background noises.
3. It's so much easier to talk to people when you don't have to worry about people overhearing/interrupting.
4. Whenever there's a group of more than around 3 people, things end up getting hectic and, IMO, aggravating.
5. It's so much easier to just sit back and relax when it's only you and a couple others.

I don't think it's a psychological disorder at all. Just because I don't like being in group environments, that automatically means there's something wrong with me? Just because I find it difficult to talk to more than one person at a time, it means that I should see a psychologist? Just because I prefer to sit back, relax, and take things slow I need to be put on some kind of medication/attend some therapy sessions? No. This is actually the exact reason I say psychology does more harm than good in your everyday situations. It makes people believe they have something wrong with them and, in that way, causes a problem in itself. I'm sure that 90% of the crap that psychologists these days will be laughed at and looked down upon 100 years from now just like how we of today laugh and look down on religious zealots and, more recently, scientologists.

Well sure, it seems something like ADD (Everyone basically has it)

The symptoms aren't making the difference, the main thing about this 'illness' is that if people or a person chats with you and if your having difficulty responding back out of fear and won't respond then yes you probably have this. It's an anxiety disorder and stress isn't uncommon in people, but most anxiety disorders is more of a contiuation of these problems (You don't have it if it only happened to you once or twice).

Basically I have these symptoms, just about most of them (Except I smile and laugh with friends) and I still talk to them. Maintaining eye contact raises anxiety in most people that aren't used to it because it's a bit of an emotional connection (Animals use it to intimidate another). Sameness and routine is in everyone, unless you enjoy being impulsive (We sit at the same spots on the bus or class because it makes us feel safe). Worry about things is personality and paranoia, it's a little uncommon and deals with many other phsycological disorders.

MANY people don't like to talk about their feelings. There are two kinds of people which is introverted and extroverted. This would be intro, and some people are more comfortable about talking with themselves because they've had better reactions and experinces from others.

(Everyone has a fear of social embarrassment, and everyone can be brave to face the music ect.)
Being very shy? There's nothing we can truly measure how shy a person can truly be, (You'd have to give examples. Would you not walk over to a guy you liked or if he walked over to you would you get away at all costs?)

There are many disorders that deal with sleep problems and moodiness (Most americans have sleep problems)

Ok I'll count the people that have autism and other people that can be very focused on one task at hand. Yes, indeed really.

Indeed. As many doctors could and would sign papers and give me medication for it.

I'll keep trying