Thank you for clarifying the issue @Yaffa
Your wife is a German citizen. Therefore you are entitled to get an "Aufenthaltserlaubnis" (residence permit) that allows you to stay in Germany for 3 years. You have to apply for it at Ausländerbehörde. In the meantime you still have "Aufenthaltsgestattung" that allows you to stay for the duration of your asylum procedure.
Here is the crux of the matter: It might take a while to get your residence permit by Ausländerbehörde. The only thing that allows you to stay here until then is your Aufenthaltsgestattung. That's why I recommend you to cooperate with BAMF and to take part in the asylum procedure. Go to the interview and wait for their decision - it's going to take a while to receive it anyway. In the meantime you can get your residence permit. Otherwise, if you don't cooperate, BAMF might cancel your case because you are not coming to the appointments. That's an unnecessary risk that you can easily avoid.
Of course you don't need refugee protection if you already have a residence permit (that gives you more rights, by the way). As soon as you got it, you can withdraw your application at BAMF.