Overly jealous aunt and cousin... is enough enough? (Its long, but please I need advice)?

My cousin and I are about 18 months apart. My aunt has always worked very hard at keeping us from being close. We never had the same group of friends and everything was always a competition and everything was always that I was picking on my cousin. I was the bully. The only time things had to be the same between us was during the holidays, our relatives had to buy us the exact same item it would just be a different color. Then there was a falling out in the family and we went several years without talking, until I decided to be the bigger person and tried to reconnect with my cousin. Now I sort of regret that. Anyways, anything I have ever done, my cousin has always had to do or some how attempt to do something better than me, like there is this ever present competition between us. and truth be told, I am so over it.

Here are just a few of the things that have happened

I had a sweet 16, she had a sweet 16.

I put vampire red in my hair, she put purple in her hair.

I held my graduation party at a local family restaurant, following year, hers was there.

I got a tattoo, she got one

I got a second, she got a second

I got a third, she got a third (and did it the day before my birthday so she could be the center of attention on MY BIRTHDAY)

I started dying my hair, she started to highlight her hair.

See what I'm talking about?

I just got a fourth tattoo, does that mean she's going to run out and get a fourth?

Anyways, I've tried very hard to try to be friends with her and either she doesn't know how, or she's just so set in her ways she thinks that I have other motives. Yet she always knows how to talk to me when she has nobody else.

I've tried to make plans with her, majority of the time she bails on me because her friends have better plans so, I just gave up and stopped making plans with her.

Anyways, last week, my cousin upgraded to the iPhone, and yesterday I upgraded to the Droid Razr, well when she found out, she freaked the hell out and told my mother that I was jealous of her and that I am always trying to out do her or some **** like that, I wasn't there because I have a job (finally something she doesn't have that I do have...sorry for the pettiness, but that is one thing I take huge pride in over her.)

Anyways, my aunt chimed in, as she always does when my cousin and I argue. She is a grown woman, my aunt needs to stay the hell out of it, so when my mother told my aunt to do that and told my cousin to take it up with me, my cousin turned around and told her that she can't talk to me because I yell and I scream and I don't act like a lady (man I wish you could see the way she gets when she's fired up and she has nerve to talk about me?) also, her and my aunt said I always have a puss on my face. Maybe I do, maybe I don't but majority of the time they come over with no warning and I am always in the middle of something or I'm always resting before I'm about to go off to work or class, depending on the day, sometimes even both. Anyways if my cousin knew anything, she would know that everything is how you approach me, if you're going to come at me with a nasty attitude I dish it back, you play nice, I play nice, that's just how I am and that's how I became because of stupid **** like this.

Another thing is, when I've needed her help with our grandmother, on several different occasions because of my work and school schedule, I caught her in several different lies. All telling me that she couldn't after I asked her if she was free and she said yes, when she would find out what it is, she would just turn around and say she had plans.

The best had to have been when she BORROWED a book from me and GAVE it to somebody else, and when I wanted it back to sell it, she suddenly couldn't get in touch with this girl who she gave it to and when I told her I wanted the money that I would have gotten for the book, she went and bought me the book to resell because "she didn't want me to hold it over her head"... I still have that ******* book because I can't sell it.

Anyways, I feel like I should say something to her because this has gotten out of hand, but everybody is just telling me to be the bigger person like I always am and just take her copying me as a form of flattery. But I really do want to say something because this has got to stop. I'm completely drained of this nonsense, that I never started but have always been the blame of.

So after taking the time to read all of this, is there any way I can approach this, or do I leave it alone and take the high road like my mother and other aunt want me to do. Truth be told, I have been up all night trying to figure out what I should do.