You're absolutely correct. Chiropractors are not real doctors, they cannot perform surgery, they did not attend medical school, and have no medical justification to heal you in anyway. From my understanding, chiropractors attempt to mimic the hands-on manipulation that Osteopaths use in conjunction with medicine, medical school, and an actual understanding of the human body. Unfortunately, for their patients, chiropractors decided to skip medical school and do not have any certifications other than their chiropractic certificate.
On the other hand, Osteopaths are fully licensed physicians in all 50 states. Osteopaths can perform surgery, can perform general practice, and they go through training which is more intensive than that of MD's. They are trained in everything an MD they can do, PLUS the hours spent learning Osteopathic Philosophy and practice. Osteopathic training permits them to understand a minute variation from normal in a patient's body, and to correct it, before it becomes a problem detectable by standard lab tests or imaging studies.
To the thread creator, if you're truly interested in medicine, study Osteopathy, not chiropractic work. After all, it is far easier to get sued for malpractice without an MD or a DO attached to your name.