Sorry,but I can't help with Google drive - I don't use cloud storage for paranoid reasons, and have no idea how drive works.

It's been a long time since I made a Google account, but there may be some kind of activation email sent your Gmail account or something. Try logging into Gmail and seeing if you can find an email with 'account activation' or something along those lines. Otherwise you might have to consider backing up your data and doing a factory reset.

You could always Google how to side-load apps for your Android version, but that's getting into some technical territory that might be overwhelming.