The logic in your OP is absolutely muddled. And it's evident I'm not the only one that followed your reasoning to you implying neuroticism is negatively correlated to creativity.

To restate your argument: openness is correlated to creativity (not controversial) and being neurotic dampens that because you care a lot what people think (no evidence).

There is no correlation between neuroticism and creativity. Neuroticism doesn't effect openness so it makes no sense. Either your argument is that neuroticism influences openness and that influences creativity or your argument is I just think neuroticism makes you less creative because I just think so. You might as well not even mention the Big 5 because it doesn't effect your last point.