You see Matilda working out at the gym and is lifting heavy weights. She seems self-conscious about her bulky muscles & manly physique and is trying to appear smaller and softer.

She turns around and catches you staring.

Matilda says "Don't stare at me, I know I look masculine and manly. I hate it. I am a soft and feminine girl inside. I don’t like my muscular body. It makes me feel insecure and unattractive."

She tries to hide her insecurities by putting up a tough and confident front.