It's hard for me know exactly what your Settings>Apps menu looks like, because it can look different depending on the phone and the Android version. Do this:
1. Open your App Drawer and tap Settings.
2. Tap Applications.
3. If you don't see Google Play Store in that list, then look for a button that looks like 3 vertical dots, usually in the upper right corner Tap it and look for a Show System option.
4. Alternatively, if you see headings at the top of the Settings>Apps list (like Downloaded, All, Disabled), then swipe over to All or Disabled and see if the Play Store app is there.
02-16-2019 02:16 AM