My daughter started college as a commuter at age 17 when I was still a JW. Her faded unbelieving father and I were committed to paying for all costs including commuting.
The day our daughter turned 18, she put her bags by the front door, informed us that she had taken out a loan for the co-ed dorm and was moving out. This was exceedingly painful for me at the time, and our relationship was strained for ten years after. We are absolutely fine now.
As a parent, I would vote for giving your parents a head's up, but only you can decide if you are ready to go it alone if they kick you out.
Wishing you all the best,
Diane