Positive thinking

We need to have a positive thinking if we wanted to be successful.Some people they are quite negative,they think in the negative way.How?For example, when they are facing problems,they will think that " *sigh* why I have to face this kind of problems?" Then they will try to avoid the problems..Sooner or later this will become a habit,bad habit.But look,you can think in another way "I will get a great experience that the others don't have if I manage to overcome it!" 

"what doesn't kill you makes you stronger"