Is it normal for my family to treat me this way?

Okay, I really just need to rant. I wish my family would just leave me alone. My younger sister has always been the favored one and I've always been pretty much hated or demeaned by most of my family. And it really hurts and they think I should just be fine with this and be happy. But, honestly, how could I be happy if my family clearly doesn't like me yet still analyzes everything I do? They only seem to appreciate whatever my sister does. And they treat me like I'm some sort of sloth and have told me that I don't ever do anything. Which is totally false. I never have any free time and whatever free time I have is usually devoted to someone else. Anyway, we both work for our grandparents. We both put in the same amount of hours but work on different days. I'm sure she works diligently. And so do I. I don't take breaks and hardly take off time for lunch. We both do volunteer work for half of the week. So, we don't get big paychecks and have to keep a tight budget. One way I cut down in expenses is by never going out to eat. And, my family always wants me to go out to eat with them. I do, only a few times a year. I can't really afford to as much ad they'd like. And when I do have some money saved up to go out with them, they only put me down and make me feel horrible. Then in my down time, I'm knitting, usually for someone other than myself. I've sold some of my works. I hardly ever watch tv, even though the rest of my family watches tv almost constantly. Right now, I'm catsitting for my aunt and uncle while they're on vacation. When they come back, I'm not even going to get so much as a "thank you." I  wouldn't consider myself a lazy person, but they always say I'm lazy and that my sister's industrious. And, they won't allow me to have a normal existence. I can't leave the house with someone in my family spotting me while they're also in town and they'll have to flag me down and complain to me some more. They constantly critique my appearance. They tell me I'm not as pretty as my sister. They talk among themselves about how I'd be pretty I it weren't for those things on my face-moles. I can't help it I have them. They say, "I can see all your veins." I can't help it I'm so darn pale. Blame yourselves and your genes. I can't help my genetics. They analyze everything I say and do. They're also my personal scale. They tell me when I gain a pound or lose a pound. I hug one of my friends and they automatically start rumors that I'm in a romantic relationship with the person. They start rumors that I'm worshipping the devil and rumors that I'm doing drugs and taking steroids. None of which are true. I honestly would rather have no family than have these idiotheads ruining my life. Why don't they just disown me if they hate me so much? It would be much easier on us all.