You’re looking for counter-arguments for Solipsism.
Wikipedia’s definition:
Solipsism is the philosophical idea that only one’s mind is sure to exist.
Further reading: Solipsism and the Problem of Other Minds
Thread with some counter-arguments: https://philosophy.stackexchange.com/questions/89321/what-are-the-best-arguments-against-solipsism
The one I personally chose for myself is the pragmatic one: Believing reality is a fantasy doesn’t actually changes your experience of it.
Edit: Broken links.
I’ll admit I don’t get it…
After that, you just start anticipating this feeling and unlock social anxiety.
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