Villain. Sister. Drunk

What makes someone a Villain?

Is it the bad things they do to the protagonist in a story?

Or is it the fact that they never get to tell their own story?

My relationship with my only sister has been for lack of a better word stressful.

And sometimes I wonder if that makes her the villain in my life's story.

She constantly moves my things around; she takes what I specifically tell her NOT  to take,

But I do not think it makes her a bad person, because villains are not one dimensional.

They are living, breathing sometimes drunk people who do shit to stress you out.