What should I do about my cousin?

My cousin. She's stupid, mean, a hypocrite, and she's a sadist to me.

I don't know where to start. My cousin and me have played together since we were little babies, to and fro, and I can't remember a time she wasn't a stupid, hypocritical sadist. When I was like 9, she splashed me with some water(and it was cold out by the way), and started laughing like a retard about it like she always does. And then a while later I splashed her back and she gets all serious and goes "don't... EVER... do that again." And I'm pretty sure she kept splashing me, and I had to change like three times. I tried to get her back but couldn't besides that one time.

Now, that was just a few years ago. One thing that you should know about me is I have phobias of having trouble breathing. Okay, so last time I slept over at her house, we were kind of wrestling around, having blanket tug of war on the floor, hitting her little brother with pillows, and so she randomly takes a blanket, puts it around my neck, and "play strangles" me. I know she was only joking around but it freaked me out so I slapped her across the face. And you know what she does? She freaks out. And I think she even did that twice.

She kicks me with her boots on and starts laughing, and I want to slap her so bad but I don't because I know she'll just kick me again.

We have this pond-like thing next to our house, it's only like two feet deep, but one day, me and my cousin and her little brother were canoing in it(Incase you can't tell, I really don't care about spelling right now), and her little brother pushes me off into the water. It's not deep or anything, but I had my good clothes on, and I got sick for like a week after that. And then they splash me more and sit there laughing. And I try to splash them and they scream "STOP, THIS IS MY GOOD SHIRT!"

And another thing is, my cousin is so stupid and thinks she knows everything. Not to brag at all, but my cousin doesn't know anything about makeup and I try to teach her some stuff but no use, I'm just a stupid girl who believes everything she reads on the internet. For example, I was telling her it's better to wash your hair everyother day and she's like "I was my hair every day, it's actually better for your hair to wash it every day." I wanted to kick her in the face.

And how about this, we were playing ball and she hit me really hard and it hurt and she started laughing. So, I hit her back and she gets all soft and she's like "ow. that really hurt", and makes me feel guilty after all the things she's done to me.

When we were at summer camp, I was joking around and told her to look in the window of the boy's cabin cause we might see them taking thier shirt off, and she laughs and gets her fun out of it, and then she tells our counselor. How nice.

And another thing, I'm scared of slugs, and so she decides to throw one at me. It stuck to my shirt and I freaked out. I had to take it off and run home.

Once, we were in my grandma's raspberry patch, and there was a BUMBLEBEE on my shoulder. I looked at it and just started screaming, and she just pointed at it and started screaming. She didn't try to help me. She just screamed and laughed. Somehow, the bee disappeared and I remained unstung.

Okay, and after she does this and about 11 other evil things in a day, I tell her about my secret crush and show her a picture and she's like "btw, he's hot and he's mine, i'm pretty and ur ugly hahaha jk" and she said she was kidding, but i know she means it.

I have a very healthy weight. when i was at her house, we were changing and she's like "your so fat!" and laughed about it. She can talk, she's alot taller than me and extremely skinny. anyway, she has no idea how much i've struggled to come to terms with myself that I'm NOT fat, and excuse me, your sadist comments don't help.

And she's such an attentionseeker, she has a super skinny body(take my word for it), extremely straight teeth, and she says "i'm so fat, i'm so ugly, my teeth are so ugly". If she's any of those things, which she's not, I don't have a chance.

And her brother also pushed me into water once and I almost drown, and she keeps bringing it up no matter how much I ask her because it bothers me to remember that and when she brings it up, i bring back and embarressing memory of hers when she had to visit a male vagina doctor, and she thinks that amounts up to almost loosing your life. I'm sorry, sanity check here!

My cousin has SOME good left. I promise. Deeep deeeeeep down somewhere, she just needs to feel the pain that she's inflicted on other people, in other words, me, and get some sense knocked into her head. She wouldn't be so sadist if she's been through what I have.