What is considered strong for a 15 year old girl?

My brother always told me to be strong you have to bench your weight and squat 2 times it. I weigh 135 and bench that, and the most I've squated 240 but i have bad knees. At a powerlifting meet I had 264 but I move my finger. I also got stares because a was a freashman. What strong depends on you and how long you've be doing it.

My brother always told me to be strong you have to bench your weight and squat 2 times it. I weigh 135 and bench that, and the most I've squated 240 but i have bad knees. At a powerlifting meet I had 264 but I move my finger. I also got stares because a was a freashman. What strong depends on you and how long you've be doing it.