Temperament and the Christian Faith, written by Old Hallesby in 1940, is an important resource in discovering, understanding and combating one’s natural tendencies and behaviors. Divided into four classes, named after the four medieval humours, (Sanguine, Choleric, Melancholy and Phlegmatic,) the understanding of the way one naturally acts can be a powerful tool for spiritual growth and discipline.
There is an online test you can take in order to have a grasp of where you stand temperamentally. This test is best taken with a few other people who know you quite well, as you’re unlikely to have an unbiased view of yourself. The test is located here.
Remember, this is not an end-all-be-all of figuring out who you are as a person. Your temperament may very well change somewhat with age, time and even spiritual discipline. Additionally, the more time you spend in fellowship with other believers and friends will increase both your self-awareness and others’ awareness of your tendencies and behaviors.