Can it be possible that I may have?

Diabettes? The reason I ask is because I have been feeling thirsty, and having some symtom of the illness. I visited my friend (who is a diabetic) yesterday to asked her to check my blood for high sugar levels with her tester, she did, and my sugar levels in my blood was 121, my friend said that was good being that I don't take medication for it, and being that I had eaten food already that day. Today I talked with my step sister that also is Diabetic, after I told her my sugar level, she told me that my sugar level of 121 was too high for a person that is not a diabetic. I am fearful of being diabetic, and at this time I don't have health insurance. Is 121 to high?