Extremely below average (20.4 is the average of those that matriculate into dental school). If you're retaking it in September but don't have enough time to study, I'd suggest not taking it until you do have enough time to focus on the DAT wholeheartedly. Also, I'd hold off on applying this cycle until you have a decent DAT score in hand. You're going to have to input these scores on your application, and some schools may auto-reject you because these scores don't meet their cutoffs, and they may not take a chance on you (i.e., wait for your new scores) because they have so many other applicants.
At this point, your GPA does not match your score at all and in fact makes it seem like there's grade inflation going on at your school- you have a high GPA, but you weren't able to match it with a high DAT score, so this makes it look like it was easy to get A's at your school--> bad!! The DAT is the equalizer and the rigor of your school can be somewhat determined by your score (high DAT with a high GPA- you know your stuff; high DAT with a low GPA- your school was tough in giving A's out, but you know your stuff; low DAT with a high GPA- you weren't able to perform well on the DAT, but you have a high GPA so your school had easy courses/gave tons of A's out).
Basically, hold off on applying and taking the DAT until you are able to dedicate time and effort to it. Not trying to be blunt or a downer, just honest. Maybe refer here to see how recent test takers studied so you can use their tips, tricks, or study schedules for your retake:
DAT Breakdown Compilation Thread (future test takers, look here!)
Best of luck!