kfb, Kol Hakavod to you! Those who feel a sense of duty as you do are unfortunately few and far between in this world.
This may not be what you are looking for, but you sound like a serious and intelligent person. I would therefore strongly urge you to read R’ Samson Raphael Hirsch’s “The Nineteen Letters,” and “Horeb.” I think that his ideas will open up a world of insight, inspiration, and encouragement to you!
Continue your college education! Learn all you can while you can, and store away this knowledge for use during you life ahead. Pursue a working path that appeals to you, complements your natural talents, in a field where you feel you can make a real contribution to the world at large! You have a great benefit, I think, in your family’s financial situation; it gives you an incredible opportunity that few working people have. You may be able to pursue a career the most appeals to your nature and where you will best contribute to society, with less of a concern for basic dollars and cents. Your desire for independence and your drive to shoulder your obligations is admirable, but please don’t miss the opportunity that your God-given financial situation affords.
And please, throughout all this, strive for excellence in Torah!!! Be ever conscious of how your chosen career path can contribute uniquely to the world’s appreciation of Torah, and also how your Torah knowledge can provide you and others a unique perspective and appreciation for your profession.
(As an example, I myself am a law student, and am also persuing smichah in Choshen Mishpat. My study of Choshen Mishpat allows me to constantly advocate and support Torah-informed perspectives on legal issues. I regularly find my teachers and peers impressed by my perspective, and I can only hope that my efforts contribute in some small way to a general recognition of the Ratzon Hashem among all peoples of the world. My legal studies too support and fine-tune my learning Choshen Mishpat.)