My brother was in JROTC/ROTC when he was in highschool. He was not troubled and neither were the other students. He made Sergent before graduating. His reason for joining was due to him being kind of a military junkie. As far as I know he had fun with it.
I don't know much myself as I was homeschooled through highschool. But if it is something you would like to do give it a try!