Verified answer

You have to be 18 to be held accountable in court for a contract you sign (unless you're an emancipated minor and can show the paper work.) So, almost no one is going to rent to you under 18.

There are people who subrent rooms without a lease agreement, and there are roommate situations that don't have all the roommates on the lease. One of those situations might work out for you. But finding your own apartment is going to be a difficult search.

Yes, as long as you have a co-signer...

No, there is no contract to co-sign, as you can't sign one in the first place.