Am i spoiled and annoying about it?

Ok THIS IS FOR REAL today at school in cooking i was forced to wash the dishes and I've never done it before (i'm in 7th grade) and my friend Jessica was helping me and it was so gross so i kept saying things like ew i'm gonna throw up and nobody should ever have to do this then Jessica asked me if i had a maid that like lived at my house and i said yes because i do then later her and my other friend were going through my pencil case and using all my pens i got really mad and told them to stop because i don't like it when people touch my stuff then Jessica said r u spoiled or something and then my other friend said yeah she is i never really thought i was

My stuff:
I have the iphone 5c
Wii U
Just got a new iMac yesterday its huge i don't know y i got the huge one lol
iPad air and mini
My first phone was an iphone
We have 4 cars (2for my dad 1for my sister and 1for my mom)
I mostly wear Barney's, kitson, free people, Marc Jacobs, wild fox, Kate spade, micheal kors (hand bags), etc
I try not to brag and i don't like people knowing that i'm well off i didn't buy any of these things myself my dad makes 1,500,000 a year the average for my town is 200,000 a year and our house costs 1,000,000 and our house in California cost 5,000,000

Wow that was a lot anyways do i sound like a brat how do i change? I don't want to be a brat

I asked this question btw i meant to say the iphone 5s not the iphone 5c

I'm not going to say you are spoiled, as "spoiled" is more a mindset than a state of being. But i will say you are very privileged. You have all sorts of nice things that a whole lot of people would only dream of having. If youre not used to doing dishes, thats not your fault. However, it IS necissary and someone has to do it. If you gotta do it, suck it up and do it.

Tl;dr: I don't think you are a bratty spoiled person, but you are privileged and i hope you realize that and are gracious of it!

The best advice I can give to you is be generous.
Give without asking for anything back (not money, but your time, your friendship, your pencils in your pencil case.
Think of your friends first.
Don't talk about anything that you own, it can make people feel less or make them feel like you're trying to beat them,
Remember your friends are the people you love and want the best for.
Remember that you are lucky to have money,
Remember that you are a good friend.
Remember that life is about trying new things and being adventurous (washing a dirty dish or two)
Remember that leaders are the one of lead by example, so treat your friends well and they will learn from you.