[Jeff Rodriguez]

My advice is to be honest with the other mentors. At the next full team meeting, tell the whole team your dilemma and what you think your options are. Tell them you can't handle the workload you have and you need help.
I also stress full team meeting. With the whole team there, some students may step up to take more responsibility.
Also, be sure you tell them what you think the consequences would be. There may be more options that you aren't seeing, simply because you just don't have enough life experience. I've been in that boat many times and other mentors can be so much help I can't even describe it.

Basically, honesty is the best policy.

Hope this helps somehow.