Why am I always so mean to my younger brother?

Anonymous
So here I am to get responses as to why, and for you guys to critisize me so I can get my head straight.

My brother is 4 years younger than me, and I really do love him. But I don't show him that I love him. Instead, I would yell at him for doing stupid things, and sometimes when I'm at my worst mood I would critisize him and call him stupid.

I would say "Why are you always so clumsy and stupid and useless" and that is the rudest shit ever. I end up feeling horrible at times but I can't take back the damage I dealt. I just want to stop the bullshit I've been giving him even though he just wants to impress his older sister.
I really do love him though, and whenever other older kids in the neighborhood bully him, I would go and protect him. Some of those 'kids' are older than me, but if I had to, I would go beat them up for the sake of my brother, so they understand that if they mess with my brother, they are messing with ME.
Even though I am quite strict on him sometimes, most of the time the way I act is because of my aggressiveness.

How can I stop and be a proper sister?
Why am I always so mean to my younger brother?
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