I always hated life, I hated people, I was a grumpy person and I was alone. I never wanted it to be this why, but I didn't have the possibility of choice, my life was like the things I hated the most I was so pessimistic. I was wrong. I mean I wasn't wrong about hating the other but you don't have to hate your life you have to treasure it, it's the most importante things you have and you have to be yourself and believe in, because the people who would help you are rare, quasi inexistance and one of them is you.
One more thing about people. Humanity is evil. just don't care about them too much, and don't get too involved with someone, the feeling of being betrayed hurt, and more you are close to this person more it's hurt. But at the end you don't think you don't belong to any place, everyone belongs to a place, you just have to find, and I'm sure there is someone who just love you in the world, or just next to you, don't give up, learn to understand people, don't be antisocial, however you don't have to make them your friends, maybe some of them but not everyone deserve your friendship. and for those three or four friends you have to treasure them.
Finally, the quest for optimism need patience and a strong personality never give up and never let someone destroy you.