Need a bit of motivation

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I need help. I want to invest in the NutriBullet and for a while now. I want to juice. I have the jack lalane one and its so bulky. I have told my mom I want to buy it and she kinda shoots me down because she says I don't stick to anything and it will be a waste of money if I buy it because I will not keep it up. So I'm obviously lacking support and determination. Do you think that making this investment would be some sort of motivation?