Is a mentor important to success?

yepp. But get many.

I think you are growing that mentor inside who will help you. I mean this as self-development.

100%. it's super important to have someone who can share some of their experiences / lessons learned with you and who can inspire you to reach your full potential.

Totally. A mentor can offer insightful advice, networking opportunities, and other essential resources. Additionally, they've probably already committed the errors you're about to commit. Discover from them.