You die. Simply as that.
And is nothing to worry about that.

>couldn't even use bitcoin without internet

Bitcoin will not solve your special needs. Bitcoin is just another escape valve... from many.
Humanity evolved hundreds of years without Bitcoin and will still evolve.
Bitcoin DOESN'T  fix everything.

What if I am a very special person with very special needs?

_couldn't even use bitcoin without internet_

TLDR: Just don't use anymore internet, smartphones, new cars etc.
Done.
I just saved you some time and money.