First, I always tell them to stop beating themselves up. Everyone has this problem when they're first learning to crochet. Second, I let them in on a secret. Even experienced crocheters have trouble keeping track of the ends of the row. Especially when the yarn has color or physical texture that makes it hard to see your stitches. Third, I give them the tip I'm going to give you.
1. Buy or find a pair of locking stitch markers. If not locking ones, at least ones that are easy to get on and off and will stay in place, not falling out before you need them to. Like the spiral kind. They're not expensive and well worth adding to your tool stash.
|Spiral stitch marker is on the left and the locking stitch marker is on the right.|
|The stitch marker it in the top stitch of the turning chain on the right and in that top of the last stitch of the row.|
|You can see where the first stitch marker showed me to skip the first stitch (ideally you would move it to the top of the turning chain) and I'm about to work the final stitch where the stitch marker is placed in the top of the turning chain.|
|My stitch markers have been moved up to the last row worked.|