Free piano sheet music with letters?

Hey guys
This might sound like a really dumb question, but are there any free
website with piano sheet music but with letters, rather than the
notes?
Its just that I really love playing piano, but I cannot read notes,
and it would be amazing if i would be able to play a popular song on
piano without asking all my friends to interpret every single note for
me.
I had a look around on google but cant find any?
Im starting to wonder if such sheet music even exists?
It would be great if anyone found such a website...
Thanks!
P.S. if there isn't such a website, is there one which free piano
sheet music for modern songs (pop?)