Was i the villain the whole time

When I was younger I had friction between me and my sister. She angered me entirely because she would always get me into trouble, whereas I wouldn't want to tell on people or talk behind their backs like she did. And when she had her friends with her she would always condescend me and shut me out of things despite being only a couple of years older. She would leave me out of things she did with out mom too, and rub it in that she could have time with her without me because she was older and could watch different shows. She got special treatment, I felt, and would scream loudly when I simply flicked her, even after she had baited me out, or was climbing trees, to get me in trouble.
But I remember now, with burdensome guilt, that I rubbed it in that I always got the highest grades out of our siblings, and would push into her on 'accident', or argue with her relentlessly. I was an arrogant little turd about winning arguments too.
We got along well for much of the time. But even now, when we're both adults, I feel guilty about it. I really don't know if I was a bully the whole time or not.