We went through a similar situation with our youngest son. As parents, we all want our kids to progress on a straight path to success but when they get to be 16, 17 and 18. they start making choices that don't necessarily go with a parents agenda. And the more the parents push their agenda, the harder kids will push back. Even though we parents have the benefit of experience, kids always think they know more than us .... and sometimes they do.
Our son turned 18 in his senior year. He was showing attitude before then but 21 days after he turned 18, we called him out on some bad behavior and he stopped dead in the middle of the argument, went upstairs, called his friends and moved out that night. The principal called 2 days later stating my son had come in to put in a change of address and of course he was concerned. Youth Services Division of Social Services got involved and were threatening action against us until they found out that HE WAS WELCOME BACK HOME IF HE ABIDED BY OUR RULES. He wasn't willing to compromise so he lived with friends until he graduated and there was nothing Social Services could do because we didn't kick him out, he left on his own.
This was the same kid who, in 8th grade, took the SATs and scored higher than most seniors. All through high school we got interest letters from Johns Hopkins University. As much as we would have liked him to go, his choice was not college. We were disappointed but in our mind it was better than paying for college, having him attend for the sole purpose of partying and bottom out.
In our case, our son knew what the expectations were. He knew that DH & I were independent at 18 by choice. His older brother did the college thing but for whatever reason, he chose not to. He's had ups and downs ever since. I've come to some conclusions when it comes to raising kids. #1. If they wants our financial support, they have to agree to our terms otherwise they're on their own. #2 We refuse to lose sleep over their decisions once they emancipated themselves. #3 The harder you try to control every aspect of a situation, the bigger the backlash. I know this sounds cold or mean but nothing makes a kid grow up faster than being faced with a hard dose of reality.
Officially Recognized Stretchpert in Stages of Life