I think too many people think that a mentor should be a full time personal instructor. That's not how it is and that's why a lot of people don't want to be a mentor to anyone.
When I first started out in SQL, I had a "mentor" for about a week. He and I went out to buy a couple of books on the subject together. He highlighted things in the table of contents in each book and said "read those things and make sure you do all of the exercises twice". He was available for the occasional question but that was pretty much it. That was before the internet became what it is today.
Today, if you blame your failures on not having a mentor, you have no one to blame but yourself and apparent lack of skills in the use of search engines and not investing time in yourself by studying. Studying also means search for the wrong way to do things and then seeing if you can fix them for functionality, performance, readability, maintainability, etc. Be your own mentor. There was little excuse 23 years ago because there were books available. Thanks to the internet, there are no excuses left.
Like some little ancient green alien said on a swamp planet in a movie, "Do or Do Not... there is no try" and, yeah... in the end, it's 100% on you. Be your own mentor. 😀