The above sentence is an example of foreshadowing.
Explanation:
In the lines shown in the question above, Romeo shows himself to be apprehensive, as it seems that he feels that going to the Capulet party will cause him to end. This is an example of foreshadowing, since it is at the Capulet party that Romeo and Juliet fall in love and this love leads them both to death.
Foreshadowing is the literary resource where an author gives information about events that will happen later in the narrative.
