If you have any doubt about what you want to do in life take some time to think about it.
Applying again next year, I'll be able to include all of my grades and test scores from this academic year, which will be an improvement. As long as I show that I'm not just wasting a year of my life, I don't think a gap year will hurt my chances of getting into school.
You also said that I'll have a lot of free time in college to explore my own interests, but isn't that a valid reason to take a gap year too? If I can go into college already knowing what's important to me and what I want to do, won't it make the experience that much better?
WDYT?
The gap year would be far better suited for this than multitasking passions and school time.