D.W.
C.-
There's nothing wrong with using Sugar. A lot of people recommend using it in moderation instead of sweeteners. You should check the label of your fat-free half and half - usually anything that is low fat is HIGH sugar. If it's milk based, it likely has lactose as the primary source of carbs (sucrose is the chemical term for table sugar).
I worked in the world of diabetes for a long time - most dieticians used to recommend using Splenda (you may want to check the labels of other things you consume because many are turning to sucralose as their source of sweetening), but with Truvia, etc. being available, the may be changing their minds.
If you're using it to enjoy your coffee, I see no reason not to continue to use it. Hope that helps.