Can you identify if there is anything in particular at the workplace impacting your mental health? Maybe you can continue working but for a different company if that’s possible, in case the current company is not good for you. To begin with, it might be a good idea to figure out what is bothering you the most? The fact that you have to work at 18, your workplace, your work environment, the work you’re required to do, etc. Understanding that will help bring clarity to what is actually the root cause.

I was in the exact same situation and my mum and dad won’t let me quit because they thought I’d just sit at home and wallow and they were right. Don’t quit, if you have something to do with your day and complain about it is genuinely keeping your emotional gears greased up. Just keep swimming till you can