I'm currently in a history class with an upcoming project where we have to make a documentary and students can choose their group members. My friend asked me to join his group. However, I’m a bit reluctant as he doesn’t really care about his grades and spends most of his time skateboarding and playing video games. I feel like if I let him into the group, it could put extra pressure on my other group members. But if I don't, it could also put pressure on our friendship. What should I do? Is it ethical to exclude certain classmates from a group project or team based on their perceived lack of skill or popularity?