You don't need a mentor to be mentored
What is Mentorship?
Mentorship is the responsibility of the Mentee more than the Mentor. It takes an attitude of enthusistic discovery to be mentored by everyone and everything around you.
Being in a constant state of learning requires you to believe you were uniquely put on this earth to contribute to humanity. When a person believes that, they don't have time to dwell on the negative. They must get up, get out, and do the best the can while they can.
Someone who sees mentorship as an attitude more than a person is never "held back" by a position of circumstance. They leverage what resources they have to do the best they can, when they can, as often as they can.