You are 100% normal. Our new society now looks down on girls like us as some weird people when a few centuries ago we would be normal lol.
I'm one of those girls that doesn't want to be a work person and more of a stay at home with the kids sort of person e.g. a housewife. It is much more rewarding.
My thoughts:
Try to get good grades at school anyways. You never know what could happen to your husband in the future. You may need to work at some point to support your family.
Learn how to be a wife. It's not too early to start. Learn how to cook a few good recipies, and keep your room clean - soon you'll be keeping your house clean :-)
Be a pleasant and caring person.
If you're going to be a housewife e.g. get married and not work outside of the house, that doesn't mean you get to be a lazy slob. If I was a guy married to a wife that stayed at home, I would want her to do all the things I couldn't do.
It seems like most guys wouldn't want to marry at this age but there may be a few.
Make sure you stay healthy, good diet and exercise, practice a loving smile, and dress respectably but well, especially in feminine clothes. I know looks aren't everything but you wouldn't go into an interview like you were dressed for the beach, would you? This will also make you more aproachable.
Even though you don't want to become a career person, you still need to be wise. Follow the news, read a lot, pursue interest and hobbies apart from regular school.
Apart from that you may just accept that you're going to have to work. It is the way the world works now, ladies don't get to stay at home anymore. Your boyfriend may also not want to get married until you are 30, everyone gets married late these days.
Good luck :-)