What if I'm a teacher who spent all day trying not to pass out from the heroin I took on Saturday?
That's horrible. What made you feel like taking heroin?
I feel like the world isn't a good place, but I can't escape using drugs even if I want to.
It's understandable if you want to escape from the world. But you shouldn't use drugs to cope so much that it impacts your work. You could get in legal trouble and it's not good for your health.
That's a loser answer. People just don't understand how hard life is.
Life is hard but it would be harder if you lost your job after taking drugs. You need to be more responsible and either stop taking drugs or take less drugs so that you can still function in your job.