If I were in your shoes, I would work 7-10 hours per week in a semi-substantive job (assuming a 12-15 credit classload and no 20-30 hour athletic team requirement). that will give you some experience and some spending money, but, more importantly, allow you plenty of other time to "explore" -- and by explore, I don't mean to go hiking, I mean to take classes in subjects that aren't necessarily in your major, to go to meetings for clubs that aren't necessarily in your wheelhouse, to go to bars that have people that don't all look like you, to hang out with your friends, to read, to grow up.
Sure, you may think you know that you want to be a doctor/engineer/vet/lawyer/whatever, but, to me, you don't really know that is what you want to do unless you fully appreciate what that field will be like and are able to adequately compare that job to other fields in which you may be interested. you may change your mind. you may not. To me, college should be a time where you learn, and not just about books. experience all that college has to offer. and if you still decide to major and work in the field that you originally wanted, great. at least you will know what else the world has to offer and be a better person for knowing.
Sure, you may think you know that you want to be a doctor/engineer/vet/lawyer/whatever, but, to me, you don't really know that is what you want to do unless you fully appreciate what that field will be like and are able to adequately compare that job to other fields in which you may be interested. you may change your mind. you may not. To me, college should be a time where you learn, and not just about books. experience all that college has to offer. and if you still decide to major and work in the field that you originally wanted, great. at least you will know what else the world has to offer and be a better person for knowing.