obligation: any act by which a person becomes bound to do something to or for another, or to forbear something; external duties imposed by law, promise, or contract, by the relations of society, or by courtesy, kindness, etc
responsibility: the social force that binds you to your obligations and the courses of action demanded by that force
commitment: the trait of sincere and steadfast fixity of purpose; the act of binding yourself (intellectually or emotionally) to a course of action
are they so horrible???