What's seen as a "blessing" suddenly feels like a burden...?

Just had another mental breakdown- the reason? I had to write yet another script for a project. Seems insignificant. Seems unreasonable. But I cried not just because I had to write a script. But because there's been a buildup that led to my outburst. Everytime I'm put in a group project, I automatically carry all the responsibility just because I'm the "smart" or "capable" one. Always the first to initiate, to break the ice, to plan, to think, to everything. I reach out, I remain open to their ideas because I'm ACTUALLY treating it as a group project but they don't reach back. In the end, they get all the rest while I skip sleep to do all the work and they get the same grade. I've tried almost every solution. Distribute the tasks, constantly ask updates, I try to be as approachable as possible, considerate, everything I could be to help them but if they don't meet me halfway, it js won't work. It's a GROUP project after all. When I had to write yet another script, all the past events came flooding back. As if my mind rewired itself to see scriptwriting as a "threat" and shut down because of everything that's happened. Ik I can get thru this, but I get tired too.