I've been where you are. I chose college, did poorly since I had no specific goals, and dropped out. After a few years of working odd jobs and then getting married, I enlisted, did really well going to college in the evenings while working on AD full time, and got an OTS slot. It was the hard way. I wasn't mature enough out of high school to take college seriously. Getting married gave me a purpose for education and enlisting helped me learn the importance of being dedicated to an objective. Today, I'm a pilot. I took the difficult road and got lucky. If I'd been in a career field that deployed more or didn't allow you to go to school every evening after working full days I doubt I'd be where I am today. Out of all of my friends I enlisted with who espoused the same plans as you, I am the only one who is flying aircraft today. I'd say the odds are against you becoming a pilot if you enlist, but that doesn't mean you can't have an overall successful career and life via that path.
I would recommend going to college. If you want to be a pilot and are completely focused on that goal, your best odds are to attend the Air Force Academy. Personally, if I were to do it again and had the understanding of pursuing a goal I do today, I would go to the university of my choice and go through AFROTC. I feel this method gives you the best mix of opportunity, education, and experience.
Edited to add: If you want to be a police officer, choose security forces. If you want to be a personal trainer or a cook, choose services. If you want to be a airplane mechanic, choose aircraft maintenance. If you want to be a pilot, the same applies. Do everything it takes to be a pilot. The most important qualifying factor, other than physical condition, is having a bachelor's degree. Prioritize as you see fit.