Hi. Your hat is too big, huh? Sounds like a gauge problem. When you can, please post a link to your pattern, you'll be able to after a few posts. Your pattern should give a suggested hook size and a yarn type, along with how many stitches per inch (gauge) you'll need to get for the hat to come out the right size. You can use a smaller hook to get more stitches per inch. It sounds like your hook and/or yarn are the wrong size.