What is normal?

I was discussing bad parenting with a co-worker of mine yesterday and we brought up the question, "What is normal anymore?" Her response was that a normalcy comes in the form of stability. But what determines if you are a stable person? Financial stability doesn't necessarily equate to mental stability. So, if you are financially stable, but mentally unstable, does that make you normal? Maybe the norm today is instability. It seems to me that everyone is unstable in some part of their life. May it be financially, emotionally, mentally, relationship-wise, career-wise, etc, everyone has room for improvement.
Is it normal to be happy? Or, have we switched over to becoming such a pessimistic world that normal is to be stressed out like the majority of the population? Does location and surroundings determine what is normal, or is it a feeling from within? For instance, say I wear the same clothes as all my friends, go to the same clubs, work at the same job, and have the same basic views and education as all of them. While that would be close to impossible of happening, let's just use this as an example. Then, I would be considered normal, right? However, if I kept everything about myself the same, but transferred my job to a new location in a new city, I would no longer be considered normal. So, at the end of the day, the term normal might as well be lost from our language, because it longer has any meaning. It is simply a comparative term that nobody knows the definition of. Here's what Webster's has to say;

Normal
noun
1 the usual, average, or typical state or condition : her temperature was above normal | the service will be back to normal next week.• a person who is physically or mentally healthy.
So if you are unhealthy in any way, you are not normal? With so many overweight people, and so many diseases and cancers growing rapidly, how can one say that physical health is a determining factor in normality? What if the majority of people are unhealthy? And how do you determine mental health, other than being diagnosed with a disorder? If you are stressed does that mean you are in good or poor mental health? Are the majority of Americans stressed? 
Hopefully these are some questions you can ask yourself in order to open your views about others. Because, at the end of the day, you are no more normal than that person sitting next to you on the subway that you are judging in your head.
xoxo