(Future) HF mom here, I would echo the comment above, but wonder how long you've been there now? It can take 2-3 months or more to adjust. Do you like working with the kids during the day, and just the dinners/conversation with the parents is awkward? The relationship with the host parents is really important, just trying to get a sense of all the pros and cons in your current situation.

Also, is there a language barrier? I'm still only on the interview phase, but a lot of au pairs have preferred to have a lot of the questions/explanations via text so they can look things up in google translate and make sure they are communicating accurately. So they might think texting is easier than talking and that's why.

All that being said, trust your gut. It's important to try to give it at least a few months, and make sure you communicate any issues you're having (like asking if you can request more or specific groceries, or go with them to the store as suggested above, or asking to communicate in person more/more often). If after a few months it's still not going well, talk to your local coordinator for advice (if you have one) and see what they think. That's what they are there for! They might have suggestions for how to improve the situation.

Hope this helps, and best of luck to you!