solipsism

noun3

1. •
   The idea that the self is all that exists or that can be proven to exist.

   • Subjective idealism also leads infallibly to solipsism, since if everything is in 'my' imagination there is no ground for belief in the existence of other subjects. — 1978
2. •
   (figurative) Self-absorption, an unawareness of the views, needs or desires of others; self-centeredness; egoism.

   • The solipsism that too frequently infects high commands has no place on a battlefield. — 2011
3. •
   (euphemistic, figurative) Masturbation.