Are these shorts too small?

Eva

So, the sizings at Sainsburys suck. I'm 13 and I tend to wear 9, 10 & 11 from there. I found a three pack of shorts and got 11 yrs because they were the only ones that didn't fall off my waist. They seemed fine but when I got home and tried them on, I thought they might be too short. Ik that people have different ideas of what is too short but just please tell me. Here's me in one of the pairs:

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