I just found out I'm 20% African American but I'm white, is this surprising?

I've always thought I was the average Caucasian woman. Physically I don't have any visible black features within me. I'm white with pink skin tones, between wavy-straight light brown hair, honey eyes and high cheekbones.

I found a picture of my father's great-great grandmother. She was a black lady. I never knew this till recently. I did a genetic testing out of curiosity and yes it came out that I have 20% of the black genetic marker.

It's interesting that we never know what we're all made up that. So yeah I'm white but still carry some black genes within me. Is this surprising?

I just found out I'm 20% African American but I'm white, is this surprising?
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