What should I do if my parents are forcing me to study a career I don't want? I want to study biotechnology and become an engineer. I'm a straight A's student and as the eldest daughter I'm quite disciplined. However, my parents don't want me to study that career and are forcing me to study instead finances. Reasons are that I have the "obligation" to continue the family's business, and that studying biotechnology on a nearby city would be too expensive even thought it's a public university.

I have already talked with my mom and just expressed her my feelings and wishes but she told me I was being ungrateful and selfish, and that I wouldn't last long on the cruel outside world so I should probably stick with a career that already has for me a planned success. 

The thing is that no matter how good it sounds to stay I just feel miserable about it. I wish to become a scientist, to create new things and help others with my knowledge, to make history, and, forgive me if this sounds cocky, I know I have the potential to do so much more than just stay on an office. 

I told her that I was considering just leaving and live on my own if the economical burden was a problem but she then started to scold me for having such a naive and foolish thought. That she knows best for me and that I shouldn't do something so stupid out of whim. That between all my sisters I was the best "shot" they had to push this family up to riches.
I'm considering now moving out as soon as I finish high school but the thought of me being wrong just crawls on me every night, what should I do?
You are presumably an adult, you should not do something so important to your life as studying only for your parents wishes. Guilt-tripping children is very bad parenting, you should not feel ashamed to do your own thing.

However, before you start doing your own thing, think about what the consequences could be. Can you afford studying without your parents help?  Can you afford being at war with your family? Is there some sort of compromise you can find with your parents? Those questions only you can answer, and you (unfortunately) have to consider them. But never feel ashamed for studying what you want to.