Group projects are the worst. Maybe there are a few exceptions, but most of the time, group projects are a lot of work for one person and a free ride for the rest of the team.
If you’ve had a different experience with group projects, you probably had someone in your group who was a leader. Good leaders stand up and stand out and treat people fairly and set expectations clearly.
Being a leader is a difficult job. So many people look to you for guidance and direction, and you don’t always have it. But you have to lead anyway, because that’s what leaders do.