My sister (12) knows karate and can overpower (male,13) me?

My sister and I had started karate together at the age of 7. Yet, I decided to quit some months later because I thought it was boring and useless while ahe continued. Yet, lately when we fight she has started being much faster than me. More than once I tried my best, but she provedshe has full control over me. What... show more My sister and I had started karate together at the age of 7. Yet, I decided to quit some months later because I thought it was boring and useless while ahe continued. Yet, lately when we fight she has started being much faster than me. More than once I tried my best, but she provedshe has full control over me. What should I do? I am quite ashamed to be constantly weaker than a girl!
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