Why do my parents keep treating my sister better than me? She get's away with everything!?

OK, before you think it's because she's younger than me, she's not, she's 16 I'm 14...

Anyway, my sister is driving me mad! She gets away with everything! Every time she does something wrong all that happens is that she gets yelled at, and it drives me mad because she does BIG things wrong like she goes out and drinks with her friends, skips lessons stuff like that (Even though it's not that BIG, it's worse than what I do) she gets told that she's grounded but my mum and dad never go through with it! My dad fair enough, he's a trucker he's only really her 3 day's at a time, but my mum gets really mad then grounds her they argue for HOURS then my sister goes into her room and screams for awhile. Then the next day she goes out with her friends again!

But, if it's me, and I do the only slightest thing wrong I'm band from the laptop, video games going anywhere other than school, and that's just if I forget to call and say where I am! And I know that someone will say "It's because your younger, she's already been through it all!" She hasn't, it's been the same way for as-long as I can remember, she always gets her way to, if she wants money to go out with her friends, she gets it, she doesn't even have to do anything! But if I want some money I get told "Well, you'll have to earn it... Blah blah blah" if it's big amounts of money, then, she'll have to earn it, but that's only like $50+ but I have to earn $5+ and again, it's not because she's older, it's been the same way forever!

My dad has even admitted that he lets her get away with to much, she almost stopped us from moving to Canada, 2 day's before we left to move, she had an argument with my mum and dad, and he got fed up and walked out of the door, I had to go out and convince him to come back and he said "I let her get away with to much, we can't go to Canada if she's gonna treat your mum like that, I can't leave your mum with her for 2 weeks at a time!" And I thought "HE FINALLY GETS IT!" Obviously he didn't or I wouldn't be writing this.

And she's a hypocrite to! Just today I can name two times! She took my chair once I got up and I was like "Ok, what ever I'll sit somewhere else" and then she got up and I took the chair back and she went all "WHAT THE ****?! WHAT ARE YOU DOING, I WAS SITTING THERE!" And I was close to hitting her, but my mum taught me not to anger wild animals, and then just a few hours later I was talking to my brother while she was watching TV and she just went "SHUT THE **** UP! I'M TRYING TO WATCH TV!" And she ALWAYS starts singing when people are watching TV, well she does it all the time, and if you ask her to stop because your watching TV she'll start getting louder, and louder and more annoying, and if you get mad at her she's like "SHUT UP THE **** UP! DON'T TELL ME WHAT TO DO!" And I told her that she does it all the time and she just told me to shut up again!

Seriously, she is driving me ******* mad and my parents keep acting like she's an angle! She always gets what she wants and doesn't have to do anything, but if I don't do some chorus for while everyone gangs up on me, they act like I do nothing but get EVERYTHING but I don't!

Anyway, why do they keep doing that? And sorry it was so long!