be all in (one's)/the head

To exist solely in one's thoughts or imagination, rather than in reality. Don't tell me that my worries are all in my head—you know this is a dangerous part of town. Your presentation sounded great, honestly. Your fears are all in the head. Cindy isn't mad at you, it's all in your head.

See also: all, head

See also:

get into a world of (one's) own
be in a world of (one's) own
be, live, etc. in a world of your own
live in a world of (one's) own
in (one's) own (little) world
in a world of (one's) own
in a world of own
in one's own world
a world of (one's) own
capture (one's) imagination

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