I can't recall one single person I can call a mentor, however...

When I first started as a developer I had a senior to work with... I knew close to anything but I was always good at research and learning on my own... But we used an asp.net framework, it was new and there was little to no useful information, only basics... When I asked the senior (let's call him Joe) for help he gave me a quick answer:
Joe: Go to file xx, there's an example of what you need there...
Me: Well, been there and that's great but it doesn't help...
Everytime I was stucked during my first week it was always some sort of the same, so I insisted this time...
Me: so, Joe... I'm really stuck on this one, can you give it a look?
Joe: I know, I've been researching a way to do it for an hour now and can't get it either...
Me: wow! Thanks... But I thought you were an expert on this...
Joe: not really, never used it before. It's as new to me as it is to you! :)

So, that switched me from "this fucking weasel won't help me for shit" to "well, let's help each other"

We became good friends, always challenging each other and from that day on I stopped asking for help, and asking where can I help others...

I had great and greatly bad colleague and seniors. Each one thought me something either what to do or what not to do, how to act or not, how to tackle problems, how to teach...

Everyone I have worked with, worked for or trained is a mentor of mine. Even those I feel like I failed training thought me how to do better next time...

Thank you guys for being grate... Thank you assholes for teaching me how to send a guy go fuck himself! Good luck for those who get stucked with me