Most of these quotes are said by the Joker, one of the villains from the Batman TV shows and movies. I'm pretty sure that all of these quotes are from the Joker, but if not I don't know who said them. 

"Smile because it confuses people. Smile because it's easier than explaining what's killing you inside." 

"They laugh at me because I'm different. I laugh at them because they're all the same."

"I am me and I won't change myself for anyone." 

"Haven't you ever heard of the healing power of laughter?" 

"I do because I can! I can because I want to! I want because you said I couldn't!" 

"Some people want to see you fail. Disappoint them."

"I respect those who tell the truth no matter how hard it is." 

"If you care about what others think of you, then you will always be there slave." 

"I'm strong because I've been weak. I'm fearless because I've been afraid. I'm wise because I've been foolish." 

"I am a lover not a fighter but I will fight for what I love." 

"No matter the situation always wear a smile." 

"People hate what they don't understand." 

"Sometimes I feel like giving up, then I remember I have a lot of motherfuckers to prove wrong." 

"No matter how good you are people will judge you according to their moods and needs."

"Sometimes people are beautiful. Not in looks. Not in what they say. Just in what they are."

"If you got my back in the darkest hours, I got yours for the rest of your life." 

"Knowledge can give you power, but character will give you respect." 

"If you feel like no one cares about you, think again. Look in the mirror. Because the person you see, needs you more than anyone else." 

"Of a scar. It simply means you were stronger than whatever tried to hurt you."

Peace for now. Stay alive.