Bullish
Part of speech: adjective
Definition: Having a muscular physique Aggressively self-confident or assertive; bullheaded rising optimistic; overly or foolishly optimistic or hopeful
Example sentence: If you're unhappy with your circumstances, then change them. Don't blame the government or your boss or the guy down the street who's better looking than you (exceptions include Hugh Jackman and George Clooney). Just take some Pepto-Bismol and be a man (or woman, for all of you bullish feminists).
Optimistic
Part of speech: adjective
Definition: Expecting the best in all possible ways.
Example sentence: Inside, I feel 30ish - I'm childish and optimistic.