I'm really sorry to hear that you feel this way. I agree that everything seems to be more white/Caucasian focused, which is a shame, because I think that black skin is beautiful!
I'm not black, but I don't think everything would be ten times better if you were white. Us white girls/women have our insecurities as well. I think everyone has things about their bodies that they are unhappy with, and that they can't change. The media are so geared towards perfection that even the most stunning models (of whatever skin colour) are not considered "good enough", and get airbrushed.
Loving yourself can be difficult, I know. I grew up hating the way I looked. Now I look back at my pictures and think, I actually didn't look that bad, and wish I would have enjoyed my youth more and been more confident, because now I have to deal with the whole aging thing! That's lots of wasted years looking in the mirror and bringing myself down about what I couldn't change.
I genuinely hope that you can learn to love yourself the way you are.