Why can't my mom be like other moms?

My mom abandoned us, she isn't interested. Seeing my friends with their mothers bonding makes me sick. My friends seem happier than me. Mom had chances to be in your lives and SHE NEVER TOOK THEM!!!!!
Yes I am bitter. I mean my mom left.
It isn't fair! Why can't I have a loving mother? I tried and I tried but my mom WONT DO IT! WHY DOESNT SHE WANT US?!