It's A Sin Lyrics

Lyric discussion by aczinke 

Cover art for It's A Sin lyrics by Pet Shop Boys

I agree. This song is definitely about a person's lifelong shame and guilt over his homosexuality. This individual most likely attended parochial school due to terms like "Father forgive me" and the ending phrase in latin which translates as:

I confess to almighty God And to you my brothers That I have sinned exceedingly In thought, word, act and omission Through my fault, through my fault, through my most grievous fault

Thanks for the translation of the Latin.