All my pictures are dark

Hi all. I’m new to film cameras and using a Kodak m35. I’ve just had a bunch of film developed and as the header says, they are all dark. Can anyone help me understand what I’m doing wrong

Hi all. I’m new to film cameras and using a Kodak m35. I’ve just had a bunch of film developed and as the header says, they are all dark. Can anyone help me understand what I’m doing wrong