As a Beginner, Won’t I Hold Back More Advanced People From Their Own Training?

No, Absolutely not. The more senior students helping you now were beginners once upon a time. Senior students helped them in the same way that they are helping you. You are giving these students their chance to help someone else and make a friend in the process. And, by the way, have a great time. The senior students are also deepening their own understanding of aikido when they are helping you. In this way, they are learning by teaching.