Why is dark skin considered bad?

Hi I'm 23 years old I noticed since 10 I was told as a brown skinned female color of caramel I'm ugly because I'm not fairskin my mom is pale lightskinned & my dad is very dark tonight I told my mom my boyfriend have dumped me being brown skinned for a lighter skinned female he been cheating on me for 5 years straight admitted he never loved me he just used me for his blue balls I saw messages from him on Instagram all his preferences have lighter skin & silker hair texures all my boyfriends past & present have cheated on me or found excuses to dump me because I'm black & have a darker complexion when I tell my mom my experiences being a darker skinned female she ignores me or walks away I feel alone when I have discussions with her about my skin tone being darker when I tell her my complexion is why everyone is mean to me when me & her go out to hang out or trips I noticed I'm racially profiled such as accused of stealing I get followed in public stores, I have got called ugly, I have seen female's of lighter complexions bullying me because I have a darker skin tone & wear wigs I have been picked on & pointed at she doesn't defend me once as female said in public beacuse I was black that I stink falsely in crowd of people my own mother laughed like it was funny & didn't defend me I wanted to cry sometimes in public she pretend she don't know me figure beacuse she lightskin she's too good for people to see her with me or if we have a conversation she stop to me when others show up , men don't ask me out as much of at all often all the attention is on her also compliments from everybody, men ask her out meanwhile I'm just the dark friend standing there often times I notice she compares herself to me such as she better than me recently I got offered treatment to fix my skin tone she seems like she doesn't want me improve my appearance like she wants to keep me in her Shadow anything that makes me prettier she against it what should I do any advice is good thank you

Why is dark skin considered bad?
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