Yes you can use your card at the pump. Just look up what people do in the US with credit cards from your country. It's going to be something like 00000, or another number in your address, or the numbers in your postal code plus extra digits.

Plus you can pay inside, as others said, or do contactless at the pump with your saved card in the phone and you won't get asked.

Sorry you had a bad experience, but this is google-able...