I have zero interest in living my life for other people. I am who I am. Don't like it? Tough shit.
Good for you.
According to Catholic thought, sin is anything which distances us from God.
We are distant when it comes to this topic, but quite close in a great deal of many others.
I like to start from positions of agreement and work from there. I find it much more productive. So I appreciate your comment that we are close in mindset on many things. I did suspect that.
But on this topic are you certain that we disagree? I'm not sure we agree on everything, but I don't believe we are as distant as you might believe. Here's why...
I met a friend in an online forum about ten years ago. Let's call him, Paul. Paul is an elderly gentleman and a devout Catholic. In fact, he almost became a priest but was washed out because he was considered to be too conservative for his superiors at that time. It seems that Paul took too much issue with Vatican II. Me being born in 1961, Vatican II was all I ever knew. But I digress. I met him at a time when I was finding my way back to faith. I considered him to be my mentor. I greatly respected him and his opinion. He is a much better man than I and a much much better Catholic than I.
In our conversations, Paul would make passing comments about his wife as everyone else does. Apparently she was the less devout Catholic in the marriage. Anyway, after several years, Paul reveals that his wife is a man. He later told me that he was worried about what I would think about him. Can you imagine that? He was worried about what I would think? It didn't change anything for me. I love Paul. I feel bad that he ever worried about what I would think. Why would it make any difference to me? Paul is a good man. God loves good men. For that matter, God loves all men. Even the bad ones.
Long story short, Paul and I discussed this subject in great depth. I argued that he wasn't sinning and he argued that he was. He thought I went to great lengths (i.e. convoluted logic) to rationalize my beliefs. And maybe at that time I did, but today I could not say it any simpler than if one believes that God so loved mankind that he chose to be born into this world to testify to the truth and sacrificed himself to reconcile justice with mercy (.i.e. he paid for our sins), then everything else will work itself out along that journey. I hold this to be true as long as one does not rationalize his behaviors.
So, are you certain we are distant when it comes to this topic?