Why do moms prefer their son than daughter?

Ok so I’m 15 and I’m very mature for my age I’m gonna be 16 in like a month , and I still can’t wear crop top , bikinis or even shorts when it’s summer, and I even have a Curfew it’s 7:00pm , I do everything in the house I clean mop and do the dishes before I got out. My brother don’t do anything and can’t even come back home at 4-5am and get up at 5am and got out and he is a good son. All my friends out here not having curfew having fun while FaceTiming me I hate.
And if I forget to do the dishes I’m disgrace to the family and she wishes that she never had me while my brother literally doe drugs.
And evrytime I ask her why my brother can do this and I can’t her answer is always (cause he is a boy) I’m not trynna make my mom look bad but I just can’t take it and me and her don’t have a mother and daughter close relationship and she is mental abusing me.
Why do moms prefer their son than daughter?
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