I'm so jealous!

I can understand the feeling. Exactly, actually. I used to pretend I was Avril Lavigne to get through the pain. If being an actress is your dream, you should try and follow it. See if you can take acting classes, if you want - then you can escape from the living hell to do something that you want to be doing. That you dream of doing. Maybe even try contacting her, and see if she replies to help. Everyone always wants something more, and you can do it. It seems like the best people get the worst lives, but you need to hold on to the idea that you're a wonderful, beautiful person and you have the potential and talent to make your dream a bonafide reality. It's not uncommon to feel this way. I really that, even if you're a skilled actor enough, acting classes would be enjoyable for you and you get away. Treat yourself to something nice for getting through the week, knowing that if Avril Lavigne could make it in the industry, it's just as likely you can make your dream a reality. I know I'm a stranger, but I hope this helps. :)

well she puts her words of life experience , and then puts them to sounds of music and beat thet fit, she proved even a girl can do it, with one tye, who was able to scateboard as good if bot better than some guys. maybe a bit tomboyish. she works for the dream of words so she can play a bit of life, to fight and defend.she practicing to do things perfect, and puts in a try. so you wana catch up, what cann you do beter than a guy. be happy for her it might be the energy she needs for her next song;-]

"Jealousy is a chemical process, you can't avoid it. But it comes from a good place because it means we give a shit, it means we care, it means we have concerns. It's when we choose to act upon it it becomes a bad thing"

Don't act upon your jealousy- spin it into inspiration. Let her inspire you and take precautions to fufill your dreams.

Avril my seem to have the perfect life, but only because she worked hard to get it. If you want something, you have to word until your knuckles bleed and it may seem everyone will try to stop you or get in your way. You need to be clear of exactly what you want.
If you want to be an actress i suggest you go talk to one of your teachers at school share your dream with him/her and get an idea of what grades you need to achieve that. When you're in college or Uni, go for courses like acting, english majors (as many actresses and actors are put into films/plays that have something to do with a book) and media studies which not only cover the acting part, but also music, staging, lighting, all of which can help get you to the acting career you want.
If there are acting classes or an amateur acting company near where you live, go see them and ask how much it will cost to take part. If your parents won't pay for it, get a saturday job cleaning offices before/after school, paper rounds, milk rounds, work at your corner shop or if you're good at crafts, make home made cards etc and sell them to shops...
But most of all, you shouldn't be jealous of Avril. She's a normal human being who suffers like the rest of us. Her life is probably a lot harder then yours. For example - what exactly do you need to worry about? What grades your getting, whether your homework is done, or whether your parents will find out the secret you've been keeping from them. Yet Avril worries about whether her new song will cause offence, which beat and musical instruments would suit her new song best, she has to put a deadline to a new album to make sure it's released on time so they can start on the videos, then touring where she's away from all her comfort zones and her family. Life being famous is very very hard. It may seem like the best thing to have, but it's very depressing and lonely. And every single person in the world is just watching and waiting for your to screw up so you can be front page news and become a laughing stock.
You could also try writing to a few acting companies asking for a scholar-ship or maybe even a job making the tea. I once knew a man who wanted to become an actor (nothing fancy in movies, just a local play-bill) but they had no places spare. So he wrote again and asked if he could be one of their lighting hands (the junior associate that helps make the lighting correct). He started working as that, and while he was learning he was watching and listening to the actors on stage, getting to know people, working himself up, and 10 years later he's one of their best stage-actors with if not leading roles, second leading roles.
It's going to be hard, and it's going to make you want to quit. But bare in mind that quitting never got anyone anywhere but regret.