This feeling happens to all of us, even our most seasoned instructors and guides have a moment (or two) during the season when they long for home.  This is 10 days of your life.  It will be different from other things you have experienced and there will be moments you might want to go home.  But, we think if you sleep on it.  Eat a good bowl of hot food and reflect.  You probably can find the resolve to push through and see the end of the program with your team.  You can always talk to an instructor if there are circumstances that make that impossible.
We would never keep you against your will. Although we do acknowledge that the course at MOI can be challenging.  We would work with you to make accommodations, but ultimately, if you wanted to leave, your parents would come and get you.