What is normal behavior?

I always thought that life gets better as we age..there will stronger relationships, better understanding, lesser problems and so n so. But from what I actually come across is that, it is a fairy tale thinking. In real there is no respite from problems and relationships are as fragile as it was before and lets not start on understanding. But that's how things are and nothing about that we can change. But how one reacts to this and how one handles is the question. Each one has there own way of handling problems and solving them, and you solve one 5 more will prop up also. There is no right  or wrong way in handling these, it all depends on whose judging.

So coming back, what decides something as normal way of handling and something as abnormal. We as humans are emotional, and each ones EQ are different. Jealousy, anger, lust, love are all normal emotions and I would categorize 'socially retarded', 'introvert', 'extrovert' all as normal. So when you term as person who is sociable on a one-to-one basis and a silent spectator in a group as abnormal behavior...something doesn't settle.