This speaks to me on such a personal level, OP.

My family is a hotbed of mental disorders and learning disabilities.

My grandmother's brother and sister had mental disorders. My uncle has a mental disorder AND learning disability.

I am the only one of FOUR kids sans any detectable mental disorder or learning disability.

It terrifies me. I've always wanted to be a parent but the likelihood that my kid is not going to have an 'average' life is so high i could cry. I'm already 100% going to need to be responsible for my two younger siblings when my Mom passes and i don't know if i could handle having a child of my own or multiple children that will rely on me their entire life.