Hello Keanichii. I like how you shared this with us because I have similar experiences about making presentations. One, I am bad at time management so I end up running low on time and have to rush through the projects I have to finish so I don't hand it in late. Two, when I do leave things till the last minute, sometimes I miss out on writing down important information. That, or I don't go into too much detail. During my pitch presentation, I made a mistake in which I left out the player experience and left the professor confused about how the player will interact with things inside of the game. It's frustrating but we all make mistakes.
When it comes to teamwork, it can take a lot of time to combine everyone's idea all into one. Sometimes, one person's ideas will be left out in the end, and that person will feel upset, but they also have to understand that everyone else's ideas might make more sense for the final game/product. I felt like this sometimes during previous Design Weeks where I came up with my own ideas and I had to readjust them because we would come up with completely new ideas and it wouldn't make any sense to use them in our final game. Don't feel like you are making yourself useless. You can always take away the ideas you have made in your own project, and change those up so they can somehow be used into the game your team has decided on.