OH happiness

Everyone has his own conception of happiness, and different people holds [different people hold]different understanding of happiness. In my opinion, happiness depends on our attitudes to life. Usually the person[people] who are optimistic have a more happy life than those of pessimitic[pessimistic] person. Because most of optimists are extrover[extrovert], they have positive-thinking and never disappointed, they also have lots of friends, have close relationships. These all lead them to have a happiness life. On contrary, the pessimistic person have[person has] another way to live. They always gloom, look down upon themselves, and they expect nothing, they usually suffer lower morale and worse health. Also, most of them living and working alone. This of coures make[This of coures makes] them feel upset and unhappy. As an optimistic girl, I always remind myself that don't not[do not] always complain the unfair fate. If we cherish all the fetails which once brought happiness to us. [i can't understand this sentence] We can[could] be happy.