At What Point, Do The Results Of Choices Become Our Own?

So my title is a bit of a mouthful. This is because tonight I taught for the first time ever, The Theology of the Body. I am team teaching it with 2 other women and 2 other men. And there was a very, shall we say "touchy" subject that was discussed. That of homosexuality. Very controversial in the Catholic Church. So of course, as the Catechists, we had to try to explain it in the way the church teaches it. James said that we are teaching you what the Church teaches because I'm not going to Hell for you. He said that if he'd get up there right now and tell them that it was okay to be gay, then when he died, God would say to him, "James, why on September 8, 2010 did you tell the class of 10th Graders you were teaching The Theology of the Body to that homosexuality was okay? When in fact, you know it is wrong?" Because if we would teach it lightly, or not as the church does, they will go off and think it's okay, and tell others, and there on our consciences, would be the fact that now umpteen people think this is okay because we skewed the truth. So in essence, what I'm trying to address is "At what point do the results of choices become our own?" If James would've chosen to go lightly about this and be like, well I guess it's okay if you think it is, then the results of his choices become his sin with devastating effects. It's crazy what one little choice can do.
This makes teaching this class so difficult. I mean we have to be dead on with the facts and the teachings that we are not allowing these kids (yes, they are kids, only 15 and 16 year old kids) to go away and think what they heard is right. And if we do not speak and teach nothing but truth, they can go away thinking the Church teaches something that it in fact does not teach! I am now responsible for these 26 students, the very well being of their souls. Am I terrified? HELL YES!!! You better believe it! It's going to be so hard. Satan is going to be testing me to the brink of breaking! This is the time where I need to devote so much time to prayer because if I allow the enemy to taunt me, then I will fail not only these kids, but myself and my God. But this is a way to take what I have been given, my resources which are my armor, and use it to further the Kingdom of Heaven.
One of the hardest things will be for me to open up and be real with these kids. I mean telling them things I haven't told anyone. I think this is a way for me to heal more from my struggles with my past and how they are hindering my future. How I have made these mistakes and learned from them. How I am using them. But most importantly telling them that I wish I was told and made to understand this before I chose to let myself fall and sin. It would have been so beneficial to me to have learned this stuff so that I wouldn't have to deal with certain struggles every day of my life. I told them that those who have ears ought to hear. I wish I would've had this opportunity that they have because I would've been a lot better of a person if I had.