It is called the diction.
Angst, in writing, is like a dark story. One that has a sad, dark, etc. plot to it. On the other hand, tone is how a writer feel towards a topic.
Simile because it uses like and as to describe something
Examples of simile sentences:
"cute as a kitten,” comparing the way someone looks to the way a kitten looks
“as busy as a bee” comparing someone’s level of energy to a fast-flying bee
"as snug as a bug in a rug" comparing someone who is very cozy to how comfortable a bug can be in a rug.
Both Derek and I will go to the dance etc...
Remove the other character and try to write the sentence as if it was just yourself doing the action: "Myself will go" or "Me will go" don't sound right, but "I will go" is correct.