Hmm, not any mentoring... but someone asked me to give a talk about Golang at a small meetup recently. I felt like a fraud. I'm not qualified to give a talk on Go!
But I went. It went really well, and I got a lot of people interested.
Cool. See impostor syndrome mentioned elsewhere in this thread. No need to feel like a fraud. Even if you know just somewhat more than some others, there can be value in what you can talk about to those others (not everyone) - this applies to any subject. The obvious caveat is that one should try to do a good job of the talk by preparing, trying to make it interesting (some), giving good examples, etc.
But I went. It went really well, and I got a lot of people interested.