Final answer:
Alejandro feels proud because he conquered homesickness at camp, pursued his passion for music, and made new friends, all while displaying courage.
Step-by-step explanation:
Alejandro, or Andy, feels proud of himself because he successfully overcame his homesickness at camp to pursue his passion for music and made great friends along the way. His courage and determination to work hard and achieve his dreams, regardless of the challenges he faced, are what make him feel a sense of pride. The experience has not only made his summer memorable but has also prepared him to face similar challenges in the future, like going to college, which will be a new and unfamiliar experience far from home.