There are a couple of very early memories for me that could have been the beginning of my travels in SF. My dad subscribed to a men's magazine called "True" that had various outdoors types of stories, fishing tips and so on. But they had stories too. One story was about a farmer that went out to the barn one dark, snowy Winter night to check on his livestock. He was gone longer than he should have been so his wife went out to see what was going on. She followed his foot tracks in the snow and they passed the door to the barn, went around the corner of the structure and disappeared. Standing there, she could hear her husbands voice calling for help from seemingly high above her. The story could have been authored by Frank Edwards, a reporter that specialized in wierd stories. I read most of his books that were something like a "Stranger Than Science" series. He reported on stuff like spontaneous combustion cases, psychics and other unexplained phenomena. I don't know if this stuff is fact or fiction. Some of it has the ring of truth while the rest is definately fiction. But it got my interest.
One afternoon when I was in the first grade my Mom called me in to see a new TV show. It was called "Superman" starring George Reeves. Following that was "Captain Video" and later they began running Buster Crabbe in the old "Flash Gordon" films on Saturday mornings. All of this was my introduction to SciFi.
The first book I remember reading was Heinlein's "Revolt in 2100". But at that time I remember bringing home a paperback I had bought at the local drug store that was a collection of SF short stories. It was one of the "Year's Best SF&F" collections. I remember my Dad seeing it and asking, rather gruffly as I remember, why I was reading "that" book. I guess he didn't exactly know what "SF&F" stood for. I have wondered myself what he thought?
Anyhow, somewhere between Superman, Flash Gordon and SF&F, I got hooked. I expect the first SF book I read is the one that I posted in the forum where I asked for help trying to recall the title. The story was about a boy finding what I remember he thought of as a "magic marble" that he and his sister kept secret. He learned to manipulate the marble using just his mind and if I remember correctly, eventually he gave the marble back to it's alien owner. It's similar to "Mimsy Were the Borogroves" but different I think.
Whatever and however it started, I've been a fan all of my life.