Answer:
This statement essentially means that you should try to improve yourself everyday. Never let yourself down.
If hes just being rude, honestly just stay in your room or something until he leaves, or maybe even tell your brother about it so maybe he'll say something to the friend. if he keeps bothering you even after all that, just tell him to leave you the FU€K alone. best of luck!!
You should always end on a note that’s likely to stick in the reader’s mind.