Becoming a stand-up comedian is not as tough as one might think. However, it requires you to have a good humor, years of experience, great imagination/creativity, and a lot of practice. Often at times, even the most mediocre jokes when delivered in the right manner, sound very funny.
This is a skill that which stand-up comedians need to have, and is developed over years of experience. Being a stand-up comedian revolves around finding humor within your own life experiences. As an introvert, you can perhaps joke about the things introverts feel so that other introverts will relate better to you and become your audience.