Half black isnt considered black?

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So my entire life I was never “black enough” or “white enough”

I’m mixed

Even women on this app have told me that it doesn’t count that I’m black because I’m not 100%

So is this an actual thing? I’ve never known what ethnicity to claim because I’ve always been dismissed about what I am by others. And to my surprise it’s always black people telling me that it doesn’t count that I’m black and that I don’t deal with racism, etc

Thoughts?

Should I just not claim my black side?