I'm not going to let my mom claim me as a dependent on her taxes
Would her not being allowed to claim you as a dependent cause things to not work out?
Of course it will work out. It's not that big of a deal but I'm not going to let her do that.
Children are expected to be claimed as dependents by their parent's in order to give them a benefit when claiming taxes. If you're not going to allow them to do so make sure you have a good reason why not. They may be upset otherwise because they'll be missing out on these benefits for no reason if they aren't allowed to claim you as a dependant.
It's my life, and I'll do as I please.
Of course it's your life but the fact remains that you're a dependent on your parents. As I said if they're benefitting from declaring you as their dependent, what's wrong in it ?