How can I share my current GPS location from google maps?
Here's what I can do on the current Play Store version of Google maps. (9.22.1)

From your screenshot, it appears that your GPS position is not accurate. In "location settings", choose "high accuracy". Get out where there's no concrete roof above your phone.

Let GPS get a good fix on your position.

Zoom in on the screen. Press and hold on the "blue dot" for a menu to appear with details of the location.

Then click the "share" button.

Choose "copy to clipboard", if that's what you want. Else choose an app to share your location info.