Is there justification for me to not be good at CSS?

I have been a developer for almost 6 years, and nowadays I am still terrible with CSS, I don't get how it works and every time I try to deal with it I feel like a fool, I have to say that that part of Web development is the only thing that makes me wonder if I'm in the right business 😥 I know I'm not the only one, just want to know how do you deal with it?