I'm 15 and she's 14 and whenever we have our sibling scuffles whether they are playful or more serious she kills me. And my dad has a weight set I use a lot and she never uses it. But she can slam my arm down arm-wrestling and when we fight she throws me around with a smile on her face with no problem. She's a normal sized girl too, she definitely weighs less than me. I feel like such a wimp and it's so embarrassing. I always thought boys were way stronger than girls. Is this common?
She is younger, shorter, and thinner than you, but she is definitely stronger than you.