When you lend yourself to a group, initiative, or event, you have to let go as once you allow your story, efforts, or involvement to be part of a greater initiative or event, you lose complete ownership--your energy, involvement, and effort becomes something bigger, and hopefully better, than you.
Of course, these greater collaborative efforts profit from optimal collaboration so that there are no surprises and the results are something you're proud of, but in general, to do good work with others requires some level of letting go and letting the work speak for itself.