If I offer you two friends with below characteristics and force you to choose one, what would you do?
Assume that these two have almost the same background and level of life and success. Just they show off their life differently.
I) One is always happy; She often smiles and seems to be completely pleased with herself. Best things always happen to her, and she enjoys the smallest thing. You never find her dissatisfied of what she has chosen herself. Even when she has lost something, she behaves like nothing bad has happened, and she hasn't ran short of luck, knowledge, money or friend. A dare, proud, cheeky mouse with lion appearance.
She makes you feel jealous to her. After you see her, you feel sorry for yourself.
II) Opposite. Generally dissatisfied. She always guesses that she will get the worst mark in the exam. She has never studied enough. Nothing special never happens to her. She never loves somebody completely. There is always something missing in her partner. She always has the worst luck in the world. There has always been other places better than where she goes. Every time you talk to her, you feel sorry for her and you try to be sympathetic.
P.S: Girls must read the post with male pronouns :)