You need an article:I lead hand to mouth existance.
I lead a hand-to-mouth existence.
Also, many people would just say "I live hand-to-mouth (or hand to mouth)."
Personally, I don't recall ever hearing a single person described as being interactive. The word interactive typically describes a machine, a computer program, a computer game, etc. It suggests that there are many opportunities for direct communication between the user and the machine, program, game, etc. It might also describe a group of people, meaning that there is a lot of communication within the group.
I suppose you could say either "You are very interactive" or "You have an interactive personality," but it still strikes me as slightly odd. Maybe it's just me. Others might have a different take on this one.
Student or Learner