My best advice? Buy–or read, online, for free–The Catechism of the Catholic Church (some have ‘searchable’ engines and you can look up ‘sin’).
At time individuals–be they laity or clergy–may have made (and sometimes with the best intentions) changes which they considered made it ‘easier for people to understand’ or ‘more relevant’ in how they EXPRESSED Catholic teachings.
The teachings did not change–but for different people, there were different emphases. At that particular parish, at that particular time, it may have been one particular person or group which THOUGHT that the words ‘unloving choice’ were the best expression to use to explain ‘sin’ to children. . .and while it is certainly TRUE that since God is love, when we choose to sin we are turning FROM God and thus by definition are unloving, therefore any sin IS an ‘unloving’ choice, sin is ‘more’ than ‘just’ an unloving choice.
And yet, since it is not truly ‘wrong’ to say that, among OTHER things, sin IS an ‘unloving choice’ --and since some people will not only find this an adequate but even perhaps a HELPFUL explanation which will lead them further on in the Catholic faith–we can hopefully not ‘dwell’ on the events of the past to the detriment of carrying on into the future. None of us has had perfect and total catechesis our life long, but if we focus only on what may have been less ‘complete’ , less satisfactory, or even flat out wrong, and refuse to ‘let it go’ and to profit by it in actually going on to learn the ‘right’ and the fullness, then we are in error ourselves. At some point we have to stop blaming Father X, Sister Y, DRE Z or whatever group, person, web site or whatever was at ‘fault’ for an imperfect expression, go on ourselves to learn the ‘perfect’ expression, FORGIVE the imperfect, and continue to follow in our faith.
As Catholics, it is our responsibility to KEEP ON LEARNING OUR FAITH. Daily. We will never ‘know it all’, we will never ‘understand it completely’–but we must every day try to deepen our knowledge and understanding. So we must study our faith teachings, in order that we may best carry out our faith teachings. We are so blessed to have so many tools available now so that we do not ‘have’ to accept ONLY what we heard ‘8 to 10 years ago’ in ONE particular place, but instead can read and see in the Catechism, in the Bible, and in the many works of the ECFs (Early Church Fathers) and in the words of our own Popes and their encyclicals, what is the Catholic faith, in its entirety and fullness.
May God bless you throughout this Lent and always.
Just phone the office, ask to speak to the priest, and ask Father if he can hear your confession. If the parish has them, he can meet you in the conessional (Yes, the kind with the screens) by being in his portion of the confessional at the designated time coordinates.