This depends on the circumstances of the project. If it’s one of those situations where you’re doing all the work or feel like everyone else is on different pages, it would be really helpful to have someone organizing things. It may help to always be the person speaking up during conversations, and when things get chaotic, be the person to slow things down and organize the situation. Say things like, “So this person wants to do it this way, but this other person wants to do it this other way. Is that right? Okay, does anyone else have a clear preference for one of these options? What is a way to combine these two options in a way we would all be willing to compromise for?” Just remember to make sure everyone’s voice is heard and you’re not talking over anyone or forcing things to go in your preferred direction. It helps to remain fairly neural, or if you do express your opinion, you make a point to ask everyone else what they think, as well.
If it’s a situation where everyone’s getting along and the project is going smoothly, the group might not need a leader. If the project is going well and everyone is participating, trying to take on a leadership role may come off as forced, or even bossy. Remember that you are not any more competent than anyone else, and your ideas aren’t better than those of the other group members. If the group doesn’t need a leader and you force it anyway, it most likely won’t work and could cause conflict in the group. While I admire your leadership, it’s just important to keep in mind that the project is the priority, and causing conflict or furthering a divide in the group will make the project that much more difficult.
I’m sure once you take that into consideration, obtaining an appropriate role won’t be too difficult. Good luck!