Is the self all that can be known to exist?

[Aegon]

My senses have gotten me through half-a-century of life. I'm cool with them -- I haven't walked off'n a cliff or jumped out a building telling myself I can fly.

I find solipsism useless since there aren't any consequences to it. Even if I'm the only thing that's "real," everything else is so real to me that it wouldn't make a difference. But ignoring that, I don't actually find the idea frightening like many people do. What I find more frightening would be the idea that I'm just a very high-functioning simulation in somebody else's experience, and they're the only "real" one.

What's frightening about that? You're relieved of moral authority, and don't even have to own your own circumstances, being at the whim of an omnipotent (from your perspective) being.

I wouldn't want either of those to happen.