Romeo is depressed because Rosaline does not return his love.
The Montagues and Capulets are enemies, locked in a bitter feud.
The Montague and Capulet families risk punishment from the Prince as a result of their brawl in the streets of Verona.
Juliet must decide whether to take Romeo’s promises of love seriously, and worries that he will not be true to his word.
Mercutio mocks Romeo’s romantic temperament and interferes with Romeo’s efforts to interact peacefully with Tybalt.

Are these things internal or external conflict?