Actually, a DO is a fully licensed physician, able to practice in any specialty (neurosurgery, psychiatry, internal medicine, etc.), in any state. They are given the same practice rights and privileges as MD's. Also osteopathic med students are able to take the MD licensing exams and to enter into MD residencies even though the DO profession has their own residencies/specialties mirroring that of the MD's. However, osteopathic medical schools will teach manipulation and will generally have a greater emphasis on the primary care specialties (family practice, general pediatrics, general internal medicine). A DO program is for all intents and purposes, a medical school.
Keigo, since you are in a DC program, I'm assuming you know the DC scope of practice so I won't go there. I'm not sure what kind of advice you were looking for but if you're having second thoughts about being a DC, you should think hard about whether or not being "stuck" in manipulative medicine is what you want for the rest of your life.