Lacking family support

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Ive expressed interest in being in the military since middle school, and started taking the idea more seriously in my freshman and sophomore years in high school. I try talking about this with my family and my dad is mostly supportive of the idea, but wants me to be safe above all so isn't as enthusiastic as I am about the idea, which I completely understand as no one wants their daughter to finally grow up just to be put in some sort of harms way. My brother thinks it's a stupid idea but he's young, so maybe he will start to support the idea as I go on in life. But my mother- she's been nothing but negative towards the idea. And I'm not talking about not wanting me to go because she's concerned for my safety, she's just flat out mean about it. She tells me I can't do it. That I'm not fit enough. That I can hardly do the house chores. That I can't even get out of bed in the morning because I've stayed up to late, and that I can't eat right. She's hardly supportive of lots of things I like and it only interests her when it's something she likes. I love the woman to death but she sure kills my spirit. Thoughts?