Largely depends on you, like your drive and personality and where you live and how you grew up. Some people learn how to float through life never having money or owning anything and maybe the grew constantly moving learning to adjust to new surroundings. Some live on the streets others couch surf and are quick to make friends or find others willing to help. Some are having trouble managing it, they're too ashamed to beg or ask for help, or simply don't know. Perhaps this is just an additional problem to a pile they already have, and being homeless is just too much.
There's a huge amount of homeless in my city, some are better at surviving at others. Some even maintain jobs and such while still being homeless, while others become victims of drugs or their minds.