Hard one for me to answer because I want to give a good answer without causing you any ill.
“Impure thoughts and actions” could mean different things for different people. For some, entertaining lust in their minds. For others, porn. For others, prostitutes. So a tiny bit more clarification is needed. Me confessing that would lead to a follow up question of “what does that mean?”
Priests I know would generally be good with “I lived with my boyfriend for many years and engaged in fornication during that time.” That’s enough to know the sin and that the number is high and no further clarification needed. Or, “I had sex outside of marriage twice.” Or, “I’ve been viewing porn many times over the past two weeks.”
Personally, I’d suggest doing what I did with some sins. Go to a parish you will never likely go to again. Say it simply and plainly without detail, and that should be good.
As far as this statement: “The behaviours of this priest were known yet he was never corrected in any way. He died and his funeral was a sickenibg circus of undeserved tribute.” I know it’s trope, and I’m not sure if it does you any good, but what mattered was his personal judgement before God that we didn’t see. Justice was meted out in accordance with His will. The good news is that at the general judgement, we’ll learn the why of things.