In narrative, an internal conflict is the struggle occurring within a character's mind.
Things such as what the character yearns for, but can't quite reach.
As opposed to external conflict, in which a character is grappling some force outside of themself, such as wars or a chain-breaking off a bike, or not being able to get past a roadblock.
The dilemma posed by internal conflict is usually some ethical or emotional question.
Indicators of internal conflict would be a character's hesitation or self-posing questions like "What was it I did wrong?".