So, do we exist, are we a figment of our own imagination, what is real.

If we are not real and it is in our mind, when we imagine ourselves going on holiday and we are on a plane, surely everyone on that plane has part of what we want to actually be.
Whether it be an old person, a child or a woman or a bloke; it's our imagination so we make everyone as part of ourselves.
Are heroes and villains our own alter egos.