Ouch. Lucky me, new Indiana laws went into effect one week before I got my license that prevents me from carrying anyone under the age of 21 in the car for 6 months, and I can't drive between the hours of 10PM-5AM until I'm 18. Grand.
It is like that in almost every state now. In Texas you can get a permit right when you turn 15; however, you must hold the permit for 6 months before you can get your license, in theory you can get your license on the day you turn 16 though. After that, there are restrictions on when you can drive, the exceptions are for work and school related events and seriously if you aren't out speeding, joy riding, disturbing the peace, etc than it really doesn't matter. I am 21 now but those were the rules when I got my license. I never technically followed the law but I also didn't get stopped during those hours and if I did there are 100 ways to get out of getting in trouble over it (assuming you weren't doing anything too dumb).
None the less, I will avoid turning this into a PRSI thread by getting into too much of my thoughts. Only to say, enjoy having your wheels, it is a great change to have some more freedom and to go places. Lucky that you were able to get a car, treat it well and it will last you a long time.