The reality 17/18 years old aren't mature enough to make a living by themselves. Personally I think legal age should be until 25 according to neurologist a brain at 18 isn't developed to make complex decisions.
Basically everyone in the rural US supports themselves completely by 20. However, we aren't a shining example of cultural success.
Anyway, OP, if you aren't just trolling us, please provide a little more information (nothing identifiable) so that people here can actually help you. Lei-Talk shared a list of resources for homeless youth in France, so be sure to check that out.
I never really understood this phenomenon among white americans specially kicking out their children as soon as they turned 18, when all neurologist and scientist have confirmed a brain isn't fully mature to make complex decisions by themselves .
Within the Hispanic and Asian community it's a bit different not sure about aframs. But prefrontal cortex normally develops late 20s (critical decision making)
https://en.m.wikipedia.org/wiki/Prefrontal_cortex
i*
Find a job.
If you're not trolling, then find accomodation immediately and then a job to economically support yourself.
For accomodation, if you have relatives, go to them and stay for a while.
If I were kicked out at 17, I'd first make an account on an internet forum to tell strangers I was kicked out.
And yeah... In France...
Legal responsibility for upbringing
Both parents of a child normally share parental responsibility over their child during his or her minority, that is, until the child is 18 years old (Article 371-1, Civil Code (CC)). Parental responsibility does not depend on the status of the parents as a couple.