Most internal limits survive because nobody ever asks them to prove themselves.

Most of what stops you has never been examined, only obeyed. It sits there as an unquestioned rule about what you are like, and because you never test it, it never has to produce any evidence. Limits survive on the quiet assumption that someone must have checked at some point. Usually nobody did.

Pick one belief about what you are not capable of and put it on trial this week. Ask what would count as proof, then go find out. Most of these convictions do not survive a single honest attempt at cross-examination.