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Your parents just don't give a shit, and never did. It's not your fault you ended up like this, but, you're lucky that you didn't turn out even worse under those circumstances, the level of neglect is just insane, and I know the feel. You know that you could be happier if you managed to just live alone, right? Do you have any means of possibly moving out? Because it'll only get worse the longer you stay in that house, and all the less likely that you'll escape, by then.
It's really not too late, still. You're not a NEET in his late thirties, yet. You could figure something out, can you not? Many people have managed to escape from the same situation, so, why couldn't you, while you still have the time? Maybe simply ask around and pressure your parents?