You can go on the Advice spot for this if you want; I would be glad to help you out.
I'll just skip to the point, instead of writing something long: I think you should just be honest with her and tell her that you don't wish to go. I'm sure that she'll understand you.
Wait, can't you solve your own problems? Anyway, there is nothing wrong with camping...obviously from the other shit you've posted you need something that will get you away from your stupid boyfriend and his stupid friend.
Do you know the only time I've EVER done something for the holidays?
Oh wait, the last time was never.
I hate camping, but I would KILL to go with my family.
If it's because you don't like camping, maybe consider it if you haven't already, at least for your mom? :]
If it's because you want to spend the holidays doing something else or just don't feel in the mood for it right now, just be honest with your mom, I'm sure she'll understand and be glad you were honest with her. :]