We control what we do and don't accept. Our limitations are based on our fears. We evaluate the capacity of others and assume it as our own. Nobody really knows their capacity. I believe we are never truly able to reach it but that's okay because the fun is in the reaching. Even the concept of capacity is limiting. If we think of our creative capacity as we do our physical capacity then we have set our selves up for mediocrity.
"Strength does not come from physical capacity. It comes from an indomitable will." - Mahatma Gandhi
Our creative capacity dictates the outcome of everything we do and strive for. It's up to you to decide where that limitation is.