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am i a bad person?

am i a bad person because i beat up my lil 10 years old sister who's turning 11 in 2 days ? (im only 13 btw) i only beat her up cause she was giving me this nasty attitude when i rung the door bell waiting .. (parents weren't home) i rung the bell and kicked it several times, screaming to open the door i didn't pull out my house key because i was holding a package that was delivered to my dad then i finally opened the door. she's on the computer and i yelled at her asking why she didn't open the door then she replies "i didnt hear you" i was you're suching a fxcking liar . and she gives me this attitude , and says something i asked her to repeat and she she's like "gooood" bxtching at me and etc etc .. then i punched her in the face , she still gave me attitude . i kept doing it til she cried (5th punch) then when my brother comes she tells him i punched her 20 times? but i'm feeling happy . because this chick always snitchs on me on EVERYTHING , and it released my anger that i had at school with these couple girls . so basl tell me , am i a bad person ?