I haven’t read all the responses, but it seems that many of the responses mention not knowing the true Church teaching.
That wasn’t the case for me. I believe learning about it in Religion class, when we studied the Baltimore Catechism, in 7th and 8th grade. I’m only 43, but our Monsignor and our Principal were older, orthodox, and stern and that’s what we learned.
My religion teacher, though, was not a trained religion teacher, she was a lay Catholic, who would give her opinions that dissented from the Catechism. I’ll give an example, when discussing abortion, we were discussing rape. 13 year old girls are somewhat animated people, so some were getting all agitated, what would a rape victim do? The teacher said that the Church permitted abortion in cases of health of the mother, and mental health counted as health. (she must have gotten confused with Doe v Bolton

)
As I got older, I went to Catholic HS and Catholic University. I knew about the Rhythm method I guess at 12/13. I learned that ABC’s were against the Church in HS and in College.
But with all that knowledge…my soul didn’t hear. I spent ages 14 to 34 in an almost constant state of mortal sin. I stopped attending Mass regularly at 14. I think in all those years perhaps I went to confession maybe 5 or 6 times. During this time, I read lots of fashion magazines, and secular things. I even read a novel about a woman who was told to not have any more children, because she would die. She was put on the pill, but her teen-aged daughter was sexually active, stole the pills. Mom became pregnant and sadly she died. So I thought it was responsible to use ABC’s.
DH and I waited to consummate our marriage, until after we were married. In retrospect, it was more of a cultural decision, than a decision to conform to God’s teaching. We are both Sicilian American, and we had the idea that, “nice girl’s wait” I was a nice girl, so I waited.
Men on the other hand, “had to do what they had to do.” I would have liked to marry a virgin as well…but that didn’t happen.
We got married in the Church, did pre-cana, again learned that it was wrong. I guess we didn’t pay attention. We used ABC’s from the beginning, first condoms and spermicides and then the Pill, for 2 reasons…it would regulate my irregular cycles and condoms wouldn’t work long term.
All this with DH having a close friendship with not one but 2 priests. (I’m not sure that they knew) DH started to get called to the Church before me…and started seeing his friend the priest regularly. We were finally challenged, “When are you gonna stop using what you are using.”
I was obstinate…what do you mean we need to limit how much “together time” we have? It took about a year for me to get on board. I was 34…we gave them up to try for a second child. She was conceived pretty quickly. First child was planned-- first go off the pill, then use condoms for a cycle to get the hormones out of your system, then start trying.
So my long rambling post is to show we need knowledge of Church teaching, but we also need the spiritual grace to follow it. Especially when the world tells you it’s irresponsible to not use ABC.'s