The problem might be the coffee itself. The stuff you buy at the store is often the cheaper robusta variety, which is known for its bitter taste. It's why it's cheap. Arabica coffee is smoother, and much less bitter in some cases. But anything from the store is also from multiple sources, meaning they take crops from all over the world and mix them together. Single source coffee is more expensive, but you can find varieties that are more delicate than store coffee and taste more fruity. Chances are you could find a kind you would be happy drinking with no added cream or sugar.

But then again, don't push yourself to try it. It's really no big deal if you don't like coffee. And honestly, it's not really good for you anyway, as caffeine is addictive and weaning yourself off of it can be a quite literal headache. Plus it raises your blood pressure, so depending on your health conditions, it might be really bad for you. You're not missing anything to be sad over. And I say that as a coffee lover.