[deleted]
So this is famously the issue with the BMI scale. It’s a diagnostic tool, not an overall indicator of health, that only compares height to weight. This can be a useful shorthand, but it has no way to incorporate body composition. Most athletes for instance are overweight or obese by BMI standard, and some folks can be under muscled with a higher body fat percentage despite being a healthy standard.
That said, body fat percentage is pretty accurately hard to measure outside of very specific medical devices. Take whatever number you came up with with some skepticism if you did it at home.
Don’t trust either of these measurements. The BMI is a racist, outdated tool that doesn’t indicate health, and any measurement of body fat outside of a couple of specific, expensive specialized scans in a medical lab is going to vary wildly in accuracy.
Also, you are 17. You are at the end of puberty, yes, but ask anyone in their late 20s and they can tell you that your body will keep changing for the next four to five years.
If you want to improve your health and fitness, find a measurable goal outside your weight. Resting heart rate is easy to measure and indicates your cardio health, for example. For people assigned female at birth or who have a majority estrogen hormone profile, measure the diameter of some body parts and tracking how they change over time works better than measuring weight. Your weight can stay the same while your waist shrinks and you gain muscle in your legs and arms, for example.