Absolutely go to confession and then tell your mother. I used to do this a lot (not the swearing on the bible part, but lying to my parents). I thought it would keep fights away and keep me out of trouble. It didnt. Lies always get found out. And it is SO much easier tod eal with things the first time through, there is just less baggage. Also, if you have lied to your parents, especially your mother, it is FAR better that she finds out you lied from you, rather than finding it out on her own. And trust me on this one, she will find out. Mothers are absolutely incredible that way. Its almost as if they have telepathy and know the future and past. Seriously, God gives mothers some awesome intuition…
:thumbsup:Exactly! We KNOW. We KNOW you. We have KNOWN you far longer than YOU have known you!
We WILL find out…somehow, someway, sometime. 
It would be far better if you confessed. The ramifications will be much easier to deal with.Lying doesn’t simply mean telling untruths. If a random man on the street asks me my full name and address and follows me until I tell him, telling him something made up is not a lie because he does not have the right to that information.
I think that this is a good point. One certainly should never lie to their mother, especially when making an oath on the the Bible. However, I do have to question what the relationship is between this mother and son if she is wanting so much knowledge of his personal affairs to the point that she requires him to make oaths on a Bible. To me that sounds like it could be a mother that is crossing way too many personal boundaries. I don’t know the particulars, but it does raise a red flag. It’s possible that the OP not only needs confession, but also the chance to talk to a family counselor.
AW!
I am sorry you had to lie to her to get out of arguments!!! It’s always tough to be honest with your family let alone a mother…Believe me…I can never win with my mother on anything, I am always wrong so in order to not have to listen to her for about 6 hours nagging about how I’m going to hell for whatever choice I made, not saving money, spending for Christmas, tripping and falling and twisting my ankle, getting cold and flu for 2 weeks, I either won’t talk to her or lie to her so I can get off the phone… I feel bad but growing up with a woman like that wasn’t easy and sorry but unless you know my mother’s and my history you would understand why I would try to avoid anything to do with my mother! most of the time at least… Anyhow, go to confession and just let it be…Next time though try to be honest or at least avoid the subject so you don’t have to lie to her…you know?! It’s best to be with a clean conscience then dreading things that you wish you could tell her but you can’t later on…How old are you? Do you still live at home? Are you grown enough to tell your mother not to worry about something? I suspect you’re too young to purchase a pack of cigarettes due to vagueness of your story.
You are right: when someone lacks a right to a truth from you, you are in no need to tell it. However, the flip side is that not being obligated to tell the truth never implies being permitted to tell an untruth. Traditional Catholic moral theory excludes lying (“the knowing telling of a falsehood”) as intrinsically evil, and literally never choiceworthy.
I was always taught that perjury was grave matter. Do tell it to the priest. However, without knowing how old you are, what the personal matter was, what led to the conversation (did you initiate the conversation, or did she start asking personal questions, and why) or if your mother has a history of abusive , nosy, or domineering behavior (since the “swearing on the Bible” part is over the top unless you have a history of legal or substance abuse type troubles), it is hard to give any other advice, especially if you should “come clean” to your mother.