When I was a kid I had a few different dream-jobs in mind. Time and experience verified those dreams. Some of them crushed and are now nice party stories. But one of them persisted and got stronger. It gave me a good, sound career - I love it and it's useful for others . I think for us INFPs it's good to keep our dreams but let them be cleaned by reality.
As to what your friend says - I have a feeling that he's not that good with practicalities of life himself. If he was well endowed in that area, he wouldn't need anybody else to do it for him .