I love the image quote (show me your friends, and i will show you your future) actually, i will grew up knowing a quote similar to the one you quoted above...that 'show me your friend, and i will tell you who you are'.

It's actually true, we see people being influenced by the life of their friends almost all the time. If all the friends of someone are into a particular field of endeavour, there is possibility of the person going into the same profession.