It kills me

We are 4 gals in our family and am the last born but mum always ignore me because am not successful than my 3 sisters!! Remember we have different fathers me and them!! I'm still staying with my aunt and I can provide for myself though I don't own big businesses, I don't drive like my sisters, but whenever I call mum she will never receive my calls, she is always like (nothing sensible I can say because am poor) I don't know what to say or do for her my hrt is melting.I went to visit her and found my elder sister at home and when ever I told to talk to mom she changes the topic and call my other sister. I gave her a gift but I found She gave it to her house maid. What should I do for her so that she can also see me as her daughter.I have always kept this has a secret all my life and keep saying to my self that she will one day love me and be proud of me.I always cry everyday she doesn't call me or text me yet she talks to my sisters all the time . Why me