Older Sister Problems!!?

When my sister and I get in an argument she is the one that starts. Like she will do anything to get under my skin and to get me angry. Then she will start annoying me by kicking or slapping me but when I HIT BACK she get SO angry at me and she won't speak to me for like a months. When we argue she says that she gonna post an embarrassing picture of me online. She will start saying hurtful things to me so she can make me cry. All those things she says makes me want to cry but I don't want her to see that I'm about to cry. She is the biggest b*tch to me.