Confessional Poetry

1. Confess means to admit that they did something shameful, embarrassing, or that they would not like to have attributed to them.
2. Personal issues, where the writer is projecting themselves as the speaker, writing about issues that previously wouldn't be subject matter for poetry often, and are considered somewhat socially taboo.  So sensitive things.
3. It's similar in that it's still poetry and talks about how the author feels and what they think about things, using literary and auditory features.  It's different in that the subject matter it covers is more personally deep, and darker.
4. Confessional is darker, and more admiting things about themselves, rather than focusing possibly on something outside their person.