Straightening your hair helps, and making a really low pony tail when putting on the hair net helps too so you don't get a headache.
Try using a hairnet. Also wetting your hair can help before e you tuck it in. But if your hair is too thick or long then you shouldn't tuck it in. even though your hair doesn't fit, if you ride than your helmet doesn't sit on your head like its suppose to. It can be a safety hazard.
I have to have my hair just past my shoulders to be able to fit it up. I put my hair up the way that Jessica Springsteen does (I know she has a video on it). Using two one knot hair nets
I soak mine before I put it up in my hair net. I also use those flat snapping hair clips that lay close to your head and a lot of hair spray.