Sorry to reply to an older comment, but you are correct. Feeling alienated from (capitalist) society or the fake mediatised and commericalised reality we're often fed is indeed different to derealization.
I've experienced the latter, and it's more like an out of body experience. Like you're floating a few centimeters above your body, or like you're watching yourself in a movie. Like you're experiencing something that feels like very vivid deja vu or like you're in a dream. Which can of course lead you to make very bad decisions.
It’s a product of this warped system of capitalism. Unite over it. Don’t pin it to your lapel.
I sometimes wonder if it isn't sometimes a deliberate attempt to individualise societal problems. Pretend the syptoms are the problem, rather than adress the cause: a sick and profoundly unfair society that is in seemingly terminal decline. You're sad about climate change? It's your fault for not taking anti-depressants. You're angry about industrial pollution? You didn't put the yogurt pot in the wrong bin, it's your fault.
A real friend wants their friends to be happy. Maybe think about that next time you selfishly decide not to go down on them.