I don't really know how it works in Roman Catholicism, but for us Lutherans, Confirmation incluldes an oath before God and his church to follow the teachings and practices of our faith. If you are not comfortable doing that, then it may be best not make that oath.
On the other hand, if there's a catechism class involved before the decision, then you might want to go through that catechism class. At the very least, you can learn more about what you're getting into.
As for confession/absolution, I have discussed elsewhere the benefits of such a practice. In 1 John 1:8-9, God gives us a specific promise that if we confess our sins, he who is faithful and just forgives them and cleanses us. This, in my view, is not a once-in-a-lifetime conversion experience, but a lifelong process of reclaiming our baptismal covenant with God when we fail or falter. Now do you need a priest to do that? Not necessarily, but for some people, it helps to get their pastor or priest involved for encouragement, counseling, and advice. Think of it like this: it's not so much airing your dirty laundry to some guy in a collar, but rather getting much needed help from someone who quite probably understands your problem, and can help you overcome it. Of course, I do recommend finding a priest or a pastor that you feel comfortable discussing these issues with, and that can be tough.
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The outward sign isn't the important part of confirmation, the inward commitment is. If you are willing to make that commitment to God and to yourself - and I must continue to stress that it is not to the individual church - then make it.
That might not be as easy as you make it sound, Dozer. Some churches require that confirmands swear fealty to their particular denomination. If such an oath is required of NT, then it might not be so easy to distinguish the outward sign from the inward commitment.
But in the end, only you, NT, can make that difficult choice. It sounds to me like you're not comfortable with it, and that being the case, I would encourage you not to do it. While I most certainly would prefer to see you confirmed in the Christian faith myself, I don't think you should be pressured into it. Either choice you make is going to be difficult. If you decide not to, then there will be conflict with your family and your church. But if you decide to do it for their sake, you will be facing conflict within yourself, and that's never a good thing.