Do you think you exist?

Serious question.

I feel like this: when I’m conscious I don’t really notice that I’m conscious at all unless I think about it. If I run my hands down my hands then I can feel it through both my hands (or for any other part of the body). PS sorry I didn’t phrase this part better, best I could do

An argument for saying I exist is because other people exist. And I can interact with those people unless I put some kind of glass sheet in between us (but spiritually) or maybe physically I am not sure.

However what if everyone else is not real and I’m the only real one? What if it’s all a cruel experiment at my expense? Is that why when I type for long enough my fingers go all spangly?