Why Is That?

I've been accumulating questions about cycling with the intent of a few posts with possible answers and responses.  But I've not gotten around to actually writing anything in the way of answers or responses. 
 
So I'm just listing a few of the questions: 
 

Is cycling mostly a mental thing?

On long rides my emotions and mood sometimes changes a lot.  Why is that?

I ride alone a lot.  Am I an introvert?

I rarely ride by myself.  I try to ride with others as often as possible.  Am I an extrovert?

Are `ultra' cyclists different from other kinds of cyclists?  If so, how?

In the `off season' I'm more edgy, my mood is different.  Why is that?

If I had to stop cycling would my mood change?

How can I keep from going bonkers during the cold and snowy seasons?

I'm an average cyclists but I buy bikes and gear worthy of a pro.  Why is that?

My work, family and social life suffer because I spend so much time cycling.  Why is that?

I prefer to ride alone.  Does that make me an introvert?  Is that a good / bad thing?

When I cycle with others I find that I try to go faster and harder, even if it offends other cyclists.

I'm a `binge bicyclist.'  Why is that?

If I'm an introvert should I make myself ride with others more?

I `dump' all my frustrations, tension, anxiety into bicycling.  Is that good?

I often find myself suffering from `overtraining.'  Why is that?

What are the symptoms of `overtraining?'

I set goals that I don't fulfill and find myself losing motivation.  Why is that?

I can't stand it when I don't meet my performance expectations.  It bums me out.  How can I handle this better?

I actually worry that I'll `explode' if I didn't have cycling.  What's going on there?

Why do I cycle?  Especially if it tires me out, interferes with other things.   Feel free to offer your own answers or responses.