At whatever age you decide to be on your own, you need a PLAN. Research not only the rents in the area where you choose to live but the cost of utilities and food/groceries.
None of this is practical without a full time job or enterprise that pays 50% more than your expenses. Before you actually move, have that full time job or enterprise.
Save a minimum of 10% of your net earnings. Put it in a savings account until it is enough to buy a secured bond then start over. When the bond matures put it all back into another secured bond or buy gold and silver coins. Check with your bank as to whether or not they will cover the weight value of the gold or silver or if they will cover only the face value if you keep them in a safety deposit box. (Some banks will not cover the weight value so do not keep your gold and silver in the banks). I recommend gold and silver because the current economy is going to burst before too long and the only REAL money out there is pure gold and silver. There are plenty of websites where you can get pure gold and silver so just Google it.
When you first move out, do not bring into your home anything that "eats"; no pets, no plants, no room mates unless they are carrying their share of the expenses but make sure you can afford the expenses by yourself because roommates are not reliable. Go for the minimum need first. Remember that most apartment complexes have rents that increase by a percentage EVERY YEAR. Ask what the increase is before you decide to rent there and be sure you can handle the increases. Most apartment complexes require the first and last months rent so your initial investment is 300% of the rent. You need this UP FRONT. Also if you've never had utilities in your name you are going to have to give them a deposit, it varies in amount from company to company and possibly from region to region. (Ask your parents if you can put one of the utilities in your name to establish credit with them before you move out, or get your own phone/internet while you are still home.) All this has to be checked out before you go.
Do you have furniture you can take from home? IF not then get used to the idea of shopping at thrift stores and Good Will or the Salvation Army for your first furniture. You can always replace a piece at a time with new furniture that suits your personal environmental style as you have the funds to do so. (I don't really recommend this but I grew up on other people's "garbage". My dad had a pick up truck and on major trash day he'd cruise the "ritzy" neighborhoods for cast offs. The furniture was still in good condition and serviceable for years)or you may be able to find furnished apartments.
If you don't want to live where there is public transportation, you need a car in good condition and easy on the pocket for maintenance. And of course a driver's license.
The most important recommendation I can give you is NEVER use credit. If you can't pay cash for it, you don't need it. Keep a savings account of at least 5% of your net earnings BESIDES your investment money. This is emergency funds and major expense money like health needs and car repair.
Work a monthly amount of medical care and car maintenance into your budget and STICK to the budget. Your monthly budget should include utilities, rent, car insurance, car maintenance, medical expenses, clothing, groceries/food, renters insurance (you MUST have renter's insurance. Your landlord will not replace your furnishings if something happens to your apartment nor does the site insurance cover someone who gets hurt in your apartment, you have to have your own liability insurance), entertainment (a must also. You'll loose your mind if you don't go out once in a while), health insurance, bank fees, and life insurance. All of this in addition to your savings and investment accounts.
Living on your own is not cheap, being home with your parents until you get married and have a family of your own is not a problem if you are pulling your own weight at home. My parents charged me a minimal rent after I got a job, if your parents are letting you live there rent free then invest money and time in maintaining their home. Being home does not mean you are excused from being responsible. Being at home you can still manage a budget and if your income is much higher than your expenses, don't spend it all foolishly. Invest it in yourself. Your first home away from your parents may be a home you purchase instead of rent if you are frugal.
Good Luck.