How do I deal with being the least favorite child?

Growing up my mother was not very good to me and my father was so so. Then I had a little brother whom my parents are much better with. I always bring up the fact that they in particular my mom are much better with my brother than they were and are with me, my mom says I am whining but I think its unfair how she has given my brother so much love and affection while on the other hand she neglected me my whole life and made me feel like worthless trash, I have a very hard time dealing with this sometimes, because I constantly wonder why I am not deserving of love and nurture while my brother is how do I get over this?
How do I deal with being the least favorite child?
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