short answer:at your age and weight 15pct or under, you won’t notice.
On top of that too many other factors infulence performance.
You’re no even close to your true potential yet so I would concentrate on other aspects first as there are sooooo many that are much more important at this point.
Don’t worry about,BW or BF, just enjoy track/training, make sure to always have fun and ejoy what you do as BF ratios is just some of the icing on the cake a few years down the road.