Little by little. Just be sure you're ready to face the world. Say I'm going out go out for a while. Get to know the world you'll be living in. You'll find out if you beling out there or still with your parents. And you'll be sticking more to the one you choose without even realizing

Get a job that allows you to pay rent, then move out.

Start saving up money. Look for a place you would like to move to and figure out what it's gonna cost you to live there and how you will accomplish that - whether you will have to get a better job, second job, etc. If it's not where you live now, find out if the area you want to move to offers the activities and type of lifestyle you want, that will help you make more friends. Or, you could go to school. That's what I did, and I found it quite rewarding :)

There's some good advice here already, so I'll just add... Don't move too fast. For some people, the real world is quite a shock, and not all parents will take you back. Find out how much it will cost, and make sure you make MORE than that because there are many, many, MANY things you probably aren't thinking about that will be expenses. If your fiannces are in order, plan it and carry it out. I know you're feeling confined, I did too when I moved out at 22, but don't rush it.

Ditto. Open up a bank account if you don't already have one, find a job, and start to put some money away. Look for an apartment that you can realistically afford--that can be hard to judge when you are just striking out on your own and have never paid for your own rent, food, lights, water, etc. If you can, look for apartments where the landlord pays some of the utilities so that you do not have to worry about lights, or water. You need to come up with a budget that works within your income. Most landlords will want you to make at least three times the rent, then you need to factor in how much you may spend buying groceries a week to feed yourself (and you will quickly find out that eating out is probably not the best option), ask people to give you a ball park figure about how much they spend on other bills like lights, water, etc. Make sure that your budget allows some room for emergencies---what happens if you get sick and cannot work? Will you still be able to pay your bills?--Try to work all these things out on paper first and come up with a plan. There is nothing worse than having rent and bills due and no way to pay them. If you are seeking independance from your parents, the last thing that you want to do is have to ask them for money because you failed to plan/budget.