Bitter: someone who is bitter is angry and unhappy because they cannot forget bad things that happened in the past.
Adjective. I feel very bitter about my childhood and all that I went through.
Bright: full of light, shining:
Adjective. Bright sunshine
Excited: having, showing, or characterized by a heightened state of energy, enthusiasm, eagerness, etc.
Adjective. An excited crowd waited for the singer to arrive.