The quote "Your happiness makes me jealous and unhappy. I am a bitter and twisted human being" from Cecelia Ahern's book "One Hundred Names" reflects deep feelings of envy and discontent. It reveals the speaker's struggle with their own emotional state, highlighting how the joy of others can sometimes exacerbate personal feelings of inadequacy and bitterness.

This sentiment underscores the complex nature of human emotions, where happiness and sorrow can coexist. The contrast between the speaker's internal turmoil and the external happiness of others serves as a reminder of the challenges many face in coming to terms with their own feelings while dealing with the success or joy of those around them.