In Act III, Scene 3 of Romeo and Juliet, Romeo is at his most immature. He spends most of the scene whining about his predicament. Earlier in Act III, in a fit of rage, he enacts revenge upon Tybalt for the death of Mercutio. He actually was at fault for his friend's death as he tried to get between the two duelists and Mercutio was inadvertently stabbed.
Shakespeare's theme in lines 64-74 of the scene is to imply there is a generation gap between Romeo and Friar Lawrence. Moreover, there is also the fact that, since he is a priest, and bound to celibacy, the Friar doesn't know about the love between a man and a woman. Romeo thinks the Friar cannot possibly understand what Romeo is going through. He has been banished and cannot be with Juliet. The Friar can't fathom why Romeo would throw himself on the ground and writhe in misery. The Friar has never experienced the depth of emotion Romeo now feels for the loss of access to Juliet.
Later in the scene, the older man brings up good reasons why Romeo should not fall into such depression. He tells Romeo to go to Juliet and consummate the marriage and then go to Mantua and be patient. When the time comes and sentiments have died down, the Friar will announce the news about Romeo and Juliet. He assures Romeo that things will work out. Unfortunately, fate has a different agenda.