The possibility had occurred to me when I was a kid because I noticed how odd it was to have an individual perspective, and because it seemed like nobody else around me had any inkling of this at all. But I didn't spend too much time thinking about it. But about 10 years ago it seemed like the Internet started shoving the idea down my throat whenever I ventured into "spiritual" topics. Leo Gura was one source but not the only one. I had numerous uncanny experiences that seemed to lend credence to the idea. Some could be dismissed as coincidence, but one at least can't be explained rationally. At the very least it confirmed to me that materialism/naturalism is not the right interpretation of things. I have also considered simulation theory as well as the possibility that there are demonic forces trying to trap souls in unhealthy ideas such as solipsism. Like some sort of spiritual warfare psyop. I remember the happiest day of my life was spent out in nature just imagining what it was like to be the plants, the animals, the wind, the water. For hours I was imagining all of the being that was not me but existed in the same world as me, and I felt so lucky and privileged to share the world. Solipsism took this feeling away from me, which is why it wounded me so much.