Do not be afraid of the outcome: the test is not about your moral character, but your physiological temperament. It is about your first reaction to external stimuli. The more you come to expose your first reaction in your answers, the more valid will be the result of the test.
To discover your dominant temperament, take the test below. To discover the combination of your temperament (dominant and minor one), take this more elaborated test: https://www.temperamentquiz.com/