I also wonder why none of my siblings suffer from mental illnesses while I do..
Mental illnesses even run in the family so its very confusing, almost everyone in each generation has at least one mental illness while none of my siblings are included in this category of people with mental illnesses, in my generation.
They are so fucking horrible to be for being like this, something completely out of my control and arguably something that is totally my parents' fault. They knew that there'd be a risk of spreading their shitty mentally ill genes down by procreating yet they still did it.. stupid..
I understand this feeling that you're experiencing and I'm sorry.