Is it a sin to not have faith in humanity?

The thing is, I love my family, friends, God, and even my enemies. I live a good life, I pray, donate, etc. However, I've had a cynical viewpoint on humanity because of how the world and it's people act. Everyday, I see hedonism triumph over love...macre over forgiveness...and overtime my faith has been draining. I know that there are good people out there, but the majority consists of bad ones. Sigh