What is a mentor? Here’s the dictionary definition:
Noun: an experienced and trusted adviser.
Synonyms: adviser, guide, guru, counselor, consultant, trainer, teacher, tutor, instructor
Verb: Advise or train (someone, especially a younger, less experienced colleague).
In order to be a mentor, you need to be seen as experienced and successful at something. A mentor gives advice and guides someone who is less experienced and successful, i.e., a mentee or protégé.