Your lawyer explained that you will not get the money until you are 18.
You have to wait until 18.
If the claim was settled with out court approval, then the release documents your parents signed on your behalf state that they must hold the money in trust for you and turn it over to you at 18.
If the claim was court approved then a judge ordered that the money be held in trust until you are 18.
There is no way for you to get the money prior to turning 18.
If you want a car, you will have to get a job and save up.