Many people make the mistake of directly comparing the cost of renting to the cost of a mortgage. However, a mortgage payment is not the cost of owning a house, but merely a part of it. Here's an
older article about the various other things that go into the cost of owning. And the cost of owning is not just coming out of your wallet...it's your time too.
Renters don't pay for wear and tear or emergencies, their landlords do. Owners pay for all that, or file homeowner's insurance claims for the big stuff. Apartment renters don't spend all weekend on their yard or house projects, but owners often do...or they pay someone to do it for them. Some people continue to rent and spend the money they aren't putting into the cost of owning a home into other things.
Remember, in the real estate sandwich, renters are the bread. Low income renters who cant afford to own are the soggy bottom slice, middle class owners are the bulk of the meat, and high income renters are the top slice, because at their income levels it often is more advantageous to have the freedom renting affords them.
There's different kinds of freedom, you have to choose what kind ya want. Each has different pros and cons that you can take advantage of, or let take advatage of you if you make poor decisions. In the end, ya gotta pay moeny to keep a roof over your head no matter what, so may as well make the most of your situation as you see it, and not as others see it.
Also, keep one thing in mind...if you go get the house, you may wind up having to actually get a job that entails more responsibility and a paycheck that shows it...
Personally, I say move back in with the parents and save your money if going back is so advantageous and easy at the same time. Can't go wrong with as big a bankroll as you can get before you take the plunge a few more miles down the road.