I hit my sister and bust her lip then my mum cried now I am being punished is this fair?

goodgirlbecky
Testerday i had a row with my sister and my mum got involved during the argument i grabbed my sister hair and pulled it as hard as i could she then pushed me so i punched her in the mouth and made her lip blead i then shouted at my mum and she started to cry my dad then marched me to my room and locked the door with a key, my parents have said i am on FULL and TOTAL lockdown until further notice, i have to eat in my room and i am only allowed out for the bathroom, its a MISREABLE punishment yesterday was 30c and sunny outside but i was SHUT away in my bedroom , and i will be locked in again ALL day. my parents haven't decided yet how long i must serve in lockdown but i hope its not long as i can't stand being shut in all the time advice please?
I hit my sister and bust her lip then my mum cried now I am being punished is this fair?
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