My goodness do I feel your pain and shame, dear friend.
I too did exactly the same as you. Married young, had 2 children back to back then talked into a tubal lig for so called health reasons. I resisted but not well enough. I let my mother who still thinks shes a good Catholic but won't budge from novus ordo, tell me back in the 70's that the church now says its ok to take birth control, etc. (Paul VI) I KNEW I should not have done it, but I let myself get talked into it by her, the doctors, and others.
Then years later, like you, I found tradition and oh my gosh, I was and still am mortified. I too confessed, but to a traditional priest. In addition to penance, he counseled me that going forward I should now think of everyone as my children. In other words, be loving and kind and motherly to everyone I encounter, mimicing the BVM, as a type of life long penance. I'm not explaining it well, but you sort of adopt everyone you meet in your heart, being extra kind, praying for them, no matter the least acquaintance. Does that make sense? If not, it's due to my inadequacy.
But before all things have a constant mutual charity among yourselves: for charity covereth a multitude of sins. 1 Peter 4:8
You will get good advice here from other people, but I would say to find a traditional priest, even if you have to make an arrangement to travel a little. Make an appointment with him to discuss this in depth. He can best guide your soul and will help you to find peace through proper penance and spiritual counsel.
Sincere repentance and lifelong reparation actually brings great joy.
I think Matthews advice is best.
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Your mother is mistaken. Pope Paul condemned the use of birth control in Humanae Vitae in 1968.
You missed the point.
Back then the whole modernizing church populace was singing that song, that hey it's ok to use birth control now. I remember that very clearly too. Somehow it was interpreted the opposite of what was supposedly stated in humanae vitae. Church authorites didn't do too much to stop the tide either. And look at the novus ordo now. Everyone is aborting in some fashion or another.
Paul The Sick Modernist did not need to have the issue studied and have protracted deliberation on it before making his statement. The very length of the deliberation gave hope to the birth controllers and also ensured that many people decided it might be ok. Many thought if it was clearly wrong, then what took so long to declare it wrong.
The issue could have been dealt with quickly and decisively by reiterating previous Church teaching against artificial contraception.
Paul The Sick was a Cunning Modernist. And many other Modernist revolutionaries both clergy and lay agitated for change. The Church had already been infiltrated by Communists and Freemasons by then, who played a role. Many of those clergy advised laypeople in and out of the confessionals that birth control was not sinful. They have a lot to answer for.