Bad performance review at work

I’m feeling really self conscious and shitty about myself after a performance review at work, and a little vulnerable.

My boss said that while I am quite good at adapting with the new changes at work, I’m also unrealistic and dishonest about deadlines and frequently say one thing and fail to meet those standards I set for myself. I was also told I’m good with people but not great at delegating tasks.

I just feel embarrassed and silly and wish I could change my brain and like I’m not meant to be in the role that I am in media. Any advice for moments like this? Where you absolutely agree with the feedback but can’t help feel shitty about your brain and people seeing through the mask?