Have to be close to mic to be heard in voice call

I have a problem where I cannot be heard when I'm at a normal distance from my mic and voice isn't picked up, so I have to be super close to it. This is also the case with other microphones such as on headphones. I don't have this problem with the normal phone or any other apps. This is on a Samsung Galaxy J3. Please help this makes calling very awkward sometimes haha