Thx for the replies, i currently have a "Suntour SF14 NCX D LO". my bike is an Insera X-Cross (2016) it has hydraulic disk brakes, the frame is 60cm (23,6").
I called a bikeshop and they told me to bring the bike over to them and they'll look for a fork for me.
Is it a good decision to even get a rigid fork if it needs to be suspension corrected. As i said, i have never used the suspension and almost never ride on sand roads?

I uploaded a picture of my bike. Imgur: The most awesome images on the Internet