soliloquy;  monologue;  speaking to oneself
 one person;  being alone;  being by oneself;  being single;  being unmarried;  by oneself
 hogging;  having all to oneself;  monopolising;  monopolizing
 alone;  by oneself;  on one's own
 aloneness;  loneliness;  solitude
 to talk to oneself;  to mutter
 bachelorhood;  spinsterhood;  celibacy;  living apart from one's family;  living alone;  person who lives alone
 being independent;  standing on one's own;  becoming independent
 self-conceit;  self-satisfaction;  self-righteousness;  self-importance;  complacency
 living by oneself;  living alone
 by itself;  automatically;  naturally
 to talk to oneself;  to mutter
 to leave (someone) alone;  to leave to oneself;  to leave (someone) be
 taking on a life of its own (of a rumour, etc.);  walking by oneself;  talking a walk by oneself;  walking unaided;  being able to walk without help;  standing on one's own feet
 single (i.e. unmarried) person;  someone alone
 just one person;  only one
 fighting windmills;  tilting at windmills;  mimicking a wrestling match by oneself (as a form of street performance, etc.)
 (on) one's own;  (by) oneself
 rash assumption;  hasty conclusion
 one-person show;  one-woman show;  one-man show;  performing solo;  monodrama
 performing solo;  having the stage to oneself;  being in sole command;  eclipsing (outshining) the others;  field of activity in which one is unrivaled (unrivalled)
 laughing by oneself;  erotic pictures;  shunga
 being the sole winner;  winner-take-all
 living by oneself;  living alone
 arbitrary decision;  taking for granted
 travelling alone;  solitary journey
 practicing by oneself;  self-instruction
 being the sole master of the situation;  reigning supreme;  standing unchallenged
 single woman;  bachelor girl;  spinster
 being the only loser;  losing by oneself
 divining one's own fortune
 (doing) karaoke by oneself
 self-conceited person;  ego-tripper;  swelled head