I agree with everyone else finish college. But I don't think you have to give up FIRST altogether. Instead tell your team you still want to help but don't have that much time this year. If your schedule is anything like my college's you will have kickoff off. So you can help them design. I'm sure they would still want to take you to nats to see them win. So don't worry, do as much as you can and I'm sure it will still mean the world to your kids. It might even make them feel better. I know when I was building and we got an engineer who we knew was busy but still showed up, even for 5 min., we still wanted there company. Good luck
~SHANA~