I have low self esteem and feel inadequate next to other women?

I am 1/4 black and I hate how I look. I have dark curly hair, olive skin and light brown eyes. I avoid the sun and straighten my hair, but I still think I don't measure up to blonde women, or women who look less "exotic". I have lost 20 lbs and I am now 5'8 125lbs and a size 4, but I still feel like crap. I think guys are too itimidated/turned off by "unique" looks. I tan super easily so I spend a fortune on sunblock and filipino whitening soaps. Do white guys really like exotic looks? All the guys who hit on me are ugly black men that I would never want to date.