Sure you have more freedom at 18 but when you hit 18 there are so many expectations for you, the pressure of having to make serious life changing decisions at that age isn’t very pleasant. I think it’s best you enjoy your mid-teens while you can.
And if you’re so dead set on being 18, spend that remaining 3 years looking at different colleges, career paths, places to live so when the time comes you’ll have some idea of how you’ll go about making these decisions. Trust me, a lot of people wish they had more time to figure things out.
Also I’m really sorry about what happened on New Years, hope you’re okay