Internal conflicts are disagreements and problems that you have with yourself.
Examples
Sarah is upset with herself because she spilled the milk on the table.
Tom is angry at himself because he forgot to do his school assignments.
External conflicts are disagreements and problems that happen with other people or things.
Examples
Ashley was mad at Diana for using all of her lip gloss
Devin was mad at his teacher for not putting all of the grades in.
Hope this helps!<3