VPN Question..unable to access some WIFi networks…

I have recently downloaded a VPN. Seems to work fine at home, but as soon as leave the house, and try to get on another WI-FI network, it doesn’t seem work…is that typical? I also want to use it when I am overseas…. Any help would be appreciated…

Thanks! I didn’t know if for example if I walked into Starbucks, would I still have Wi-Fi access with my VPN, regardless of which one I used.