There are two key steps to gaining self-awareness. First, objectively determine which actions are positive and which are negative.
Second, focus on your own actions to see whether they fall into the category of positive or negative. Before doing any action, ask yourself, "Is this a proper thing for me to do or not?"
Even when you are not in the midst of any particular activity that would call for such inner questioning, think over your previous actions. Become aware of your negative behavior in order to avoid it in the future. Think carefully about strategies that will help you refrain from negative behavior. And of course, be aware of your positive behavior in order to increase it.
What positive behavior do you wish to increase? Today, think about actions you can take to increase that specific aspect of your behavior.
(see Rabbi Moshe Chaim Luzzatto - Path of the Just, ch.3)