If today you do not know what your calling is, spend quality time with God and you will not be let down. Also ask yourself what do you love doing. What is it that you can do even if you were not being paid to do it. The things you love doing most are a great indicator of your purpose in life. It does not have to come in a big way. God chooses the foolish things of the world to confound the wise. Do not belittle yourself. Let his perfect will be done in your life.