Being a daughter at home doesn't mean being a financial burden. A creative, hard-working daughter can be a blessing to her family (yes, financially as well) while developing the techniques of spending less and stretching every penny that will be very useful someday for a stay-at-home wife and mother.
Maybe a frugality isn't a habit for you. I know it wasn't for me; it required changing my entire mindset: from "must have it" to "can do without it", from "it costs almost nothing" to "I don't really need it", from "not buying whatever I want is suffocating" to "being enslaved to my whims is truly suffocating".
There are many resources you can find online which will help you on a path to a more frugal life. You will be encouraged by the stories of countless people who spend less and live more, people who made choices of frugality and simplicity, people who cut up their credit cards and have never been happier. Frugality isn't just spending less. It's being creative and resourceful, patient and thankful.
A few practical points that help me on my path to frugality:
I buy second hand. For a long time, I wrinkled my nose at yard sales, second-hand shops and thrift stores, equaling price and quality – that is, until by chance I found some real treasures. Yes, it takes time and effort, but it does pay off, and no one can guess I buy second hand. Also, no one would ever know how little I actually spend on clothes, unless I told them. You can also sell your unneeded items, earning some extra money and ridding your home of clutter at the same time.
You have to be wise with this one, though. Don't settle for low quality because it's cheap – it will cost you more in the long run.
I don't have a car. Most of my friends who insisted on having cars during college either ended up accumulating debt, or working many long, exhausting hours, or both, at the same time complaining for the money they had to pay for gas and other car-related expenses. I always had a much smaller side income for my own needs (giving lessons and translating), out of which I put a considerable sum into savings. I'm debt-free, and intend to keep it that way.
I give handmade gifts. I love giving gifts, and would be very put off if frugality meant I can now do less to make my loved ones feel special. Fortunately, it doesn't have to be so; far from it! Learning to knit, crochet and cross-stitch opened a whole new set of possibilities for me; even with the most basic level of these skills, you can make a variety of useful gifts everyone will love: scarves and blankets, doilies and dishcloths, and even bookmarkers. They are not only practical, but you can make them personal (for example stitching the initials of the person for whom the gift is intended), and people will appreciate the time and love poured into them, as opposing hurriedly chosen gifts from a department store.
Even if you've never held a needle, you still have a wide range of possibilities to be frugal and creative with your gifts. A personal scrapbook or a stack of handmade cards; baking mixes for special breads or cookies, beautifully wrapped and with a recipe attached; a collection of different sorts of tea, with homemade cookies to go with, and a lovingly written note – I'm yet to meet the person who would say no to one of these!