There is math to it most people don't account for. You can be "thinner" with a higher percentage of BF because you simply don't have a lot of muscle mass.Like I said the pic is terrible. It doesn't show lff your physique very well. I could be off but I would say you're closer to 20 than 15.
20? Damn bruh I would of guessed like 15 I was 5’9.5 and 189 pounds in that picture and the pants I had on were a 32