"And they that be wise shall shine as the brightness of the firmament; and they that turn many to righteousness as the stars for ever and ever." Shine like the stars. (Daniel 12:3)
Ask yourself this when someone says you can't do it. What's holding you back? Exactly. Nothing but them and you, but only because you are letting them.
Dear Self. You know what they say about perfectionism...don't you? Why you don't have to be perfect, and in fact it's necessary that you don't try to be.