No milk supply

Is it even possible to get low or no milk supply, my first is almost 13 months I had very low supply, bear in mind I did all the things that needed to be done like skin to skin, supply and demand and all that stuff but still expresses only 30 ml in an hour if I’m lucky, was sad and disappointed but got over it but this is my second baby and I can’t even get anything, and it’s becoming to get to me and I feel like I’m not doing enough, has anyone else been in this shit situation?