You should be working the stitches in the chain space, that is instead of working in the stitch itself you go around the chain. It occurs to me that the only difference between crocheting a square and a circle is in the number of stitches increased so I found this video for a granny square. She shows crocheting into the space, I think that's where you're having a problem. https://www.youtube.com/watch?v=11Wh7IOT9BI
There are other crocheters here and they may be better able to help you but HTH.