It is fine to get a dog providing you have no intention of ever leaving home because then your family will have to care for it and probably deal with the end of life bit too...I suggest that you volunteer at a rescue centre for the time being, get used to caring for a dog...walking, grooming, picking up poo, cleaning up vomit, feeding etc etc and then you will be a very good carer for your own animal....if you plan on college you won't be able to take it with you and some residences don't allow you to have pets even when you are working.