FI've points on disability is not an obstacle for success
Answers
Disability can (depending on the thing at which you’re vying to be successful) very well can be an obstacle, due to factors that are both intrinsic (my physical make-up) and extrinsic (society’s preconceptions/misconceptions/fears regarding people with disabilities) in nature:
Intrinsic factors: I have incomplete paraplegia and can’t stand without hanging on to something; this is an obstacle to my becoming a successful Olympic hurdler. I also likely can’t be a successful construction worker due to the restrictions placed on me by my Spina Bifida.
Extrinsic factors: Able-bodied people still have many assumptions and misconceptions about what people with disabilities (be they mobility-related, emotional, developmental, etc.) can do. This might prevent a job-seeker with a disability from matching up with employment that might otherwise be perfect for him/her.
That said, I consider myself fairly successful. I adjusted my expectations and strove to do as well as I could at the things at which I could/wanted to succeed.
Also, success isn’t just to do with employment. I also wanted to meet someone, fall in love, and wed. Since I was interested in this, I got myself out there and dated, eventually meeting and marrying my husband. It maybe was a bit tougher due to societal views of people with mobility-related disabilities, but it worked because I put myself out there, trying to find someone and/or be found by someone with whom I was compatible.