I have two people I would call mentors.

Both of them came as products of my environment.

No one owes you a single thing, and time is the most valuable resource any of us have. The common tie I see between the two people I would call this are simple:

1. They saw I wanted to build things, could admit I was wrong, and was willing to learn

2. I kept in touch with them regardless of circumstance, seeking nothing but a hello and how are you doing.

If you want someone to just magically come along and guide you, this is the wrong path. Relationships are two sided and though you cannot offer expertise mentors often have a personal reason for investing their most precious resource into someone: They see something. Demonstrate this.