Feedback is good. It’s an evidence of life. It’s proof of existence (of quality/worth or the lack of it).
It’s not about “not caring” about what people think, it’s about understanding how what you’re doing comes across.
It’s like a mirror, it’s not necessarily for VALIDATION as much as it aids EVALUATION. You don’t always need it, nor do you always have to use it, but when you come across it, make sure it enhances you, your image and what you’re doing.