My homemade alcoholic beverages taste acidic?

You don't mention batch size. Two tbs citric acid might be too much. You also don't mention sanitation methods except for the campden tablets. You could have bacterial contamination. If neither is the problem and the acidity is not unpleasant, you can treak the results with strong tea (to add tannin) and glycerine (for sweetness and mouthfeel).