I am the same I am pretty skinny for a guy, I am like 5'8/5'9 and I am 53kgish but luckily since I am not really tall I don't look lanky or stupid but just skinny.
I am hella fussy eater so I don't eat much but when I do I don't eat much, like I never have breakfast because it usually makes me feel sick. But if I am hungry and moody af I could eat 7 doughnuts ez. Maybe we just have a fastish metabolism. Nothing to worry about tbh