The phrase "am good" can be replaced with a number of synonyms to convey the same message while adding a little variation to your language. Examples of synonyms include "am great," "am excellent," "am fine," "am awesome," "am superb," "am proficient," "am skilled," "am capable," "am talented," "am impressive," and "am outstanding." These different phrases all express the idea that you are doing well or skilled at something, but each one adds its own distinct flavor to the sentence. Experiment with different synonyms to add some variety to your language and express yourself in new and interesting ways.