The baseline of your potential isn’t what you’ve done in the past, nor the accomplishments of those you know about around you. The baseline of your potential consists of the best you know of right now. In some cases, the best you know of right now will be much less than what you thought yourself capable of before, and in other cases it will be much more.
The best you know of right now is the best you sincerely believe to be possible given your understanding of yourself, others, and the world. The best you know of right now is your idea of what the ideal human being would do in your circumstances. You construct this idea of the ideal based on what you have learned about the world and yourself and the examples of the best people you know of—whether they are similar to how you are now or not.