You can always quit your sport and remain in the college. You would obviously lose any athletic scholie money if you were at a D-1 (obviously, no D-3 athletic money). but don't stress. Give it a shot. Yes at any level it is a great time committment, but you will learn to manage your time. Also, the team, coaches, etc. provide you an instant connect to the school and typically great support.
At a D-3 IMO there is typically more understanding that classes come first. I think it is also typical that at a d-3 you are a student-athlete and at d-1 more of an athlete student though.
IMO you will also find that fellow students, professors and those in the job market or grad school administrators have tremendous respect for the time and effort that athletes put in and in representing their school.
And as the post above noted, all divisions most definitely recruit. There are differences from sport to sport, size of the school, size of staff and what they can offer (divisions differ in # and type of scholarships, etc.)