The conflict in the story Diary of a Wimpy Kid is about this one kid named Greg, who has a low profile in his social life. Which is a person vs. person.  Greg and his best friend want to change that and become Popular before the end of their school year. Greg feels like his best friend is not helping him with that, until one day his best friend's arm broke. His friend was getting a whole lot of attention from the popular kids, so Greg decides to do the same, though, Greg was faking it. it didn't work out for Greg, so he felt alone. Greg's older brother tried giving him clues, but Greg didn't listen.

The resolution is Greg finally decided to give up and just be himself for the rest of his life. His best friend's popularity didn't last long either, so he joined Greg again.