Of COURSE you are worth something! Have you ever made someone smile? Have you ever done a favour for another person? Have you participated in any kind of team activity/event? Do you care for any other people in your life? Have you helped an animal or the environment in any way, even if it just means picking up some litter you came across one day? If you have had any positive impact on anyone/anything -- no matter how big or small -- then you have value. Sometimes the impact we have on others is greater than we perceive, and we start thinking that we are "useless" or "worthless" because we haven't done something earth-shattering like get elected to parliament or broken a world record. But you never know ... that time you gave someone a friendly smile may not have meant much to you, but to them, your smile could have meant the world.