I tried to donate blood but I couldn't because my iron levels were 10.8 the first time and 11.1 the second time. Are iron levels of 10.8 and 11.1 low?

Yes. For someone your age it should be above 12 for a woman and above 13 for a man. You may be deficient in iron, get tested at your doctor's to see if you should take supplements or look into any other causes.