Yes, it is possible to be too low. That’s usually associated with Type 1 diabetes. Generally an autoimmune disease in which the beta cells of the pancreas are destroyed resulting in little or no insulin production. As a result, they have uncontrollable blood glucose levels.
Your insulin levels are probably…unremarkeable 
That’s a good thing lol. Normal is normal. If a physician were looking at your results they would also have to look at your blood sugar levels at the time of testing. If your blood glucose was high then it’s something to be concerned about.
A low normal insulin with a good blood glucose value and good HBA1c value is a good thing. A low normal insulin with a high blood glucose value and a high HBA1c is something to be concerned about.
Not having high fasted insulin is a good thing as that’s an indication that you’re not on the trend towards insulin resistance. The body of knowledge for low normal insulin levels is much smaller and that’s because it probably doesn’t have a whole lot of clinical significance. Not much money in researching something that’s probably not that significant.