I don't have a degree in theatre and I've been a working, professional stage manager for going on 8 years. A degree may have helped, but not having one hasn't hurt me. You just need to make sure that you go out there and get the experiences that you need. Experiences that a theatre degree would have given you. You also may not be paid as much as someone backed by a degree, but that all depends on the theatre. I've been able to work without a theatre degree, but everyone is diifferent. You have to do what works for you. And if a pursuing theatre full time in college doesn't work for you, then I think that that is just fine.
~Deb