OP, I am a white parent of a mixed race child, and I can see how the disappearance of your Dad may have led to complex abandonment issues, you being the ‘only one’, maybe him being blamed, even subtlety, over the years, the context of a society where racism is still evident, maybe as a child you even took on done feelings of guilt of some kind. The black parent having gone. I don’t know. But counselling could maybe help you find out.
Because none of this is about anything ‘wrong’ with you. It’s just about finding out why you might feel so.
I am so grateful that I had my DC’s father in the family. I know I wouldn’t have been able to provide as much in the way of support, understanding, role model, access to wider community as a sole white parent of a mixed child. I mean none of us ever can. As women we parent boys, most children who grow up gay are born to straight people and so on. None of that makes it wrong, IMO, to recognise issues of being ‘the only one’ , away from a support network.
As for the ‘mixed race people are beautiful’ thing, it makes me tear my hair out.
Many m/r people are beautiful. Many mono-racial people (of all colours) are beautiful. Are black kids more beautiful for having the blackness of the black parent ‘diluted’???? How offensive is that?
OK the whiteness of the white parent is also ‘diluted’ but in the context of a still-racist society, where western beauty standards as are heavily biased… it’s not the same.
And there is a hint of exoticism, fetishising M/r kids. “Oh m/r children are so beautiful’ … so when this is said around your child about ‘their category’ as a generalisation (even though it would probably not be said if the child in question was not noticeably ‘beautiful’ in the default definitions) they are actually being othered. And told that they are separate from their black or white parents.
It’s a complex issue. People might disagree with aspects of things I have posted here. And will have different experiences or perspectives. But one way or another, glossing it away as not an issue would be disingenuous or unaware.
OP, you are not alone. There are novels and theatre pieces about growing up mixed race. I saw a show called Colour by this artist and it was beautiful. Her experience may be very different from yours but she explored the fact that there are things to be explored.
All good wishes for your own onward journey.