Ds just turned 16. He goes to school but wants to go off adventuring in the october holidays. He has a sometimes girlfriend who is homeless and suffers from schitzophrenia, but is also very charming and bright. Not sure if he wants to go with her or if she's just inspired him with the romance of independant street living
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She's currently staying at a house in a town nearby where I suspect drugs are sold 
How do I stop DS who says he'll do what he wants regardless of what I say. Do I let him go and trust he'll be sensible ( he is pretty sensible and mature generally) and let him see what independant living is really like (probably pretty crap and uncomfortable)
A bigger part of me is terrified for his wellbeing and wants to protect him and keep him safe at home.
In reality how can I stop him if he chooses to leave ? I am so thankful he is sticking with school after lots of threats to give up. If I come down hard my fear is he will give up and leave now before the holidays.
I know he's craving autonomy and adventure and I can see his need is to feel free. Maybe he'll see that life is not that great away from home comforts.... but he's only just turned 16. It feels such a young and vulnerable age and I'm fearful of exploitation and bad influences.
He doesn't even have a fixed plan just vague ideas of roaming round europe, we are not uk based. I've so far avoided wading in hysterically (which is how I feel inside) and told him I need more clarity about his plans and that we need to talk about how he thinks he will keep safe.
What do I do... It's such a delicate balancing act talking to teens