"confessional about" is correct and usable in written English.
You can use it to refer to something that is an admission of guilt or shame, or in which a person expresses their feelings or opinions in an open and honest way. For example, "She was surprisingly confessional about her struggles with depression."
There was nothing autobiographical, much less confessional, about his approach.
It seemed part marketing and part confessional about her choice to embrace condo living.
It was the American critic Mack Rosenthal who first used the term "confessional" about a certain kind of poetry.
The movie is filmed like a third-person confessional about the lives of others.
There was nothing confessional about his performance until "Mama's Eyes," a standout for its terseness and intimate gravity.
In the nine years since the group's breakthrough debut, "Old World Underground, Where Are You Now?" (Last Gang), its glamorous singer, Emily Haines, has only grown more helplessly, brutally confessional about her own foibles.
He's got a disarmingly nerdy, un-showbiz stage persona, and he uses it to perform offbeat songs on the oddest of subjects, such as a mock-confessional about imagined childhood traumas, or a love song employing every letter of the phonetic alphabet.
What really sets Banks apart, though, are her lyrics, particularly her unflinchingly intimate confessionals about doomed relationships.
Hurt-filled confessionals about family abandonment could easily fall flat in front of standing evening drinkers, but the white-clad Heritage Orchestra keep the energy levels up as the sumptuous, complex arrangements shift from classical serenity to Psycho-like violin intensity, over the pulverising electronic sub-bass energy of a club.
Over a simple guitar figure shoved forward in the mix, Bono rasps a confessional lyric about love - battered and broken but, he hopes, about to be mended if he can make himself grovel sufficiently.
Their responses roamed from baby scrawl to the succinct ("Queer Eurasian") to existential statements about being "millions of particles fused together". There are confessional writings about discomfort with curly hair and constant internal debates over which heritage is "better". Some defined themselves as what they are not: not exotic, not foreign, not half-and-half but fully whole.
