Depression - Teen Support Group
Teen depression is marked by persistent sadness, discouragement, loss of self-worth, and loss of interest in usual activities. Depression can be a temporary response to many situations and stresses. Teens may be more susceptible to depression due to the normal maturation process, the stress associated with it, and conflicts with parents as they become more independent.

Don't make your happiness dependent on other people. If you do, you will wind up miserable no matter what happens. And yes, thats hard advice that will take years to put into practice. But trust me, living for others never works out.
The day you go off to college or move out, you can PICK who you spend time with, and JUST spend time with people who "get it." Today is not forever, ok?
I know that seems like forever. But you'll be ok. What other people survived, YOU can survive. Humans are like that.
And dont starve yourself. A double mastectomy isnt a huge deal, and starving yourself causes other health problems