Welcome to Wefugees and a belated welcome to Germany :)
It is unfortunately common to wait so long for your papers to be processed and to receive your interview date. I have attached a couple of helpful documents about the asylum procedure to this message. Have you submitted your application already, or not yet? I found some resources where you are living, so that you could get advice also in person from people who have a better idea of the processing times in Straelen and who you could talk to:
Use the form on that page to send a message, I can´t find a direct email address anywhere on the site.
There is also the Caritas in Straelen:
Telefon: 02834 9151-98
Hope this helps already some :)