First: Breathe, no need to panic. IT.WILL.BE.OKAY.
Second: You likely started teaching to teach, right? This new student will absorb your teaching like a sponge, even if you do not see it readily. He or she should be a breath of fresh air – a student who actually WANTS to learn!
Third: Above all, DO NOT SAY you can’t hold their hand or don’t have time for him or her. They will read this from you, even if you try and hide it. Please do not be this person as a model for education in the US.