I Am Depressed

I don't know what to do woth life anymore. My parents divorced, mom abandoned us and just general things. I don't deserve a great life. I have a loving dad and four older brothers but I have a big hole in my heart where my mom should be. I'm almost 18 and I'm happy to accomplish so many things and I'm graduating next month but my mother is going to miss out on me going to prom and graduating. :(