I wasted my father’s money for two years in college getting quite good grades but with no earthly idea what I wanted to do with it. I finally said that’s enough and enlisted.
Sounds exactly like what I did. After the first couple of semesters of failing grades, I still insisted to my father that "I didn't want to waste four years of my life in the military."
After the third semester and a half, I drove myself to the Navy recruiter's office. I enlisted for six years, got some great schooling, advanced to E-6, but then eventually got out.
After the military experience, I was completely motivated. I promptly enrolled back at a decent state school, finished with honors, a technical BS degree, and have been more than gainfully employed for over 20 years. It's a lot easier to get through college when you're motivated and paying your own way. [Because I didn't know I would ever go back to school, I didn't use the GI Bill.]