I lost my iPhone and I don't have find my iPhone on?

If this helps I was logged in to my apple account

Consider it gone and move on. You were to lazy to put it on and made it easy for a thief.

I don't think you can get it back. If it had a password consider yourself safe from any fraud of any kind.
Try calling your phone and see if anyone answers.
if nothing happens… Well your phone is gone and its probably time to get a new one.

It wouldn't help, if you were on your Apple account (as most would be anyway). The key would have been that Find my iPhone app.