Files and folders starting with a period (.ssh) are hidden by default. To find private/public key, run this commands:
ls -a
In your case, run this commands to find the ssh keys:
cd ~/.ssh
then:
ls -a
Now you should see the keys like this:
. .. id_rsa id_rsa.pub
If the keys are not there then definitely you need to create the key by ssh-keygen command.