Use app without google play?
Yeah it is Possible.

I think you are developing your app using Android Studio. In Android Studio go to the option Build -> Build APK for building your app. Then you can share your app with your friends. But Android requires that all APKs be digitally signed with a certificate before they can be installed. So you need to sign your app.
Here is a tutorial for building signed app. Then Click on Build -> Build signed APK for building your app.