A person who suffers pain or difficulty without complaining  

Sadist: a person who derives pleasure, gratification, or enjoyment from inflicting pain, suffering, or humiliation on others  Optimist: a person who generally has a positive outlook on life and tends to expect favorable outcomes in various situations  Pessimist: a person who generally has a negative or pessimistic outlook on life and tends to expect unfavorable outcomes in various situations  Philosopher: a person who engages in the study and pursuit of wisdom, knowledge, and the fundamental nature of reality, existence, and human experience