home truth 
noun (usually home truths)
An unpleasant fact about oneself, especially as pointed out by another person: what he needed was someone to tell him a few home truths...
- What unfolds is a cry for justice from the family and a search for truth that also leads to some unpleasant home truths.
- With the additional upheaval of his 30th birthday, Ray is forced to confront some awkward home truths when old school friend Ivan comes for a visit.
- He said: ‘I am not going to apologise. The club has got to face up to some home truths.’