I actually have 3 favorites. One is Spider-Man Into the Spider-Verse because I was absolutely stunned by the animation style and how it keeps a very comic-book like movement. Another is La La Land because of how they use music to tell the story, especially when it's music without words. I also really like the ending because it is a truly bittersweet ending. My third and final favorite is The Secret Life of Walter Mitty, and for one reason alone: the cinematography. Every single frame of the movie is absolutely jaw-dropping and it's just extremely beautiful.

I'm only in high school so I'm pretty young still too. My recommendation is to keep making movies and create a portfolio to show off your work when you can get a film industry job. I'd also say if you have a piece that you're extremely proud of show it too some different people and get their opinions. If you're getting good reviews maybe try submitting it in a film festival or a film competition.