How Can I Get My Mother To Understand Me And See How Most Of The World Treats Their Daughters?

I wish I could tell you something that would change the way your mother feels about you but the truth is that my own biological mother treats me like the dirt on the ground that she walks on sometimes when a mother does this you need to just grit your teeth and prove her dead wrong about you even if she never understands that you are a human being and deserve to be treated like one at least you will have the satisfaction of knowing that you have proven to yourself that you ultimately deserve that kind of love... That's what I did and my mother still doesn't see it but I now have a family full of in-laws that would love to disagree with her and how she has treated me... I got an early birthday present today from my mother in law and I burst into tears because it has been so long since I have felt that kind of motherly love. 
What I am ultimately trying to say is that when you show yourself the kind of love that you deserve, others will see it too even if its not the person you had set out to change, I hope someday you will feel as happy as I do now having a second chance with someone who can show you the love your mother never could....

Have you tried searching for your biological mother maybe that would open up your adoptive mother's eyes....

Good Luck and I'm here with my shoutbox open if you need to vent...:)

This may have nothing to do with you being adopted and your brother being the natural child.  Some women are very partial to their male children and the competitive with their daughters.  It is  a lose/lose situation.  At twenty-five you  need to probably get some counseling to help you get a better understanding of your options.  There are nurturing people in the world who would like to be your friend.  Your mother may be incapable of ever being a loving mother to you.  You can make up your own "family" or support system by choosing some really good friends.   I doubt that your mother is ever going to treat you like you want.  But you can fill that void with the love of a good man and making a home and family for yourself.  You can give the love your missed to your own children and in doing so you will be healed from the hurt and frustration you feel at your lack of mothering.  It is like a miracle.  For some reason there is a cosmic law that to get what you need you should give it and them it comes back to you double!  Really.