Frustration and Trusting in God's Plan

I get kinda frustrated when God changes things up on me like this. I was supposed to lead a Confirmation retreat in Maryland for the retreat ministry we have here on campus. Well, that got changed when I found out today I have to go on my household retreat, which is the same weekend. I feel like I've abandoned my team...I've been involved in SENT ministries since almost the beginning of the semester. Now, I just have to drop it. It's so frustrating. It's not fair to me, my team, or the kids who will be on this retreat. I know I'm totally committed to household, but I feel really bad having to abandon my team. I was with some of my closest friends, and now, they too feel like I've abandoned them. They understand, but they were all really disappointed when I told them. I'm extremely disappointed too. But I guess it's all in God's plan, as frustrating as His plan can be. I'm just trusting Him and letting things go His way...