Sharing Happiness and Pain

I recently thought about how my friends deal with their happiness and pain. Do they share it with me. Interestingly, I found out that the concept of sincere friendship sometimes stands as a myth, but then not all the time. Just that the level of sincerity and empathy varies with each relationship and the incidents. Check out the following groups:

1. People who want to share with you their happiness "only." I mean they don't think that worries are worth sharing. Also, they like others craving to be them. So, they keep away the emotional trash which suffocates them within. It is, in fact, a type of "fake positivity" that kind of leaves you depressed.
2. People who want to share their sorrows with you, but are ashamed. They dont want you to think that you are pathetic.
3. People who dont share happiness or sorrows - they think each relationship should be like a business deal. Discuss the specifics of any event if it means something to them, else keep quite. Human Robots, kind of!
4. People who fake empathy - like if you are sad, they act sad (inside they will be overjoyed at your misfortune); or they take your happiness as their happiness (inside, they will be brimming with jealousy).
5. People who genuinely empathise and give you good advice and solutions. They make an honest effort to stand in your shoes and see the picture and try to tell you how they might respond if they faced the particular situation/problem as yours.
6. People who are like rubber bands - they stretch just to fit in a situation for survival, and then be their self only when no one's around or only when they are absolutely sure that they can take the other person for granted by being themselves. Basically, this group of people can socialise well.
7. Sweet-mouths - People who flatter flatter flatter and survive. They flatter in order to get the gossip - they flatter to catch hold of your attention - i mean in most cases, they flatter others and take advantage of their misery/happiness.
8. People who are selective regarding whom to share their problems with. They keep their friends at different levels - such people are good observers.

I guess the list can go on and on - now, which group do I belong to? - I think I am a little bit of everything - complicated!