That makes sense then. When people talk about their ISP ping, they're usually talking about how long it takes to get out of the ISP's network. So that 5ms Cloudflare ping is likely pretty close to what people would consider your internet's ping.

Speedtest.net is a really common tool for measuring this, since it will automatically check where the closest server is. For your connection, any ping above 5ms you can probably assume is based on your physical distance to the server, or latency on the server's end. I'm guessing Google doesn't have a server quite as close to you as Cloudflare