Maybe because they expected you to become someone they wished to be, maybe they thought you would be like they thought you are,that's why they keep on asking you that..it's ok don't be alarm and don't bothered too much of what they say or expect just be yourself and if you think you're doin ok and good in your own then be happy don't let them define what you are and who you are..you are what you are because you're unique and you have a purpose which they know not.