First of all, who are you going with (family, co-workers....?) and are they paying for it or someone else? Second, why don't you like them? Third, do you have to spend all your time with them, or will you have time to be by yourself?
Honestly, I would say go for it, regardless of your answers. Experiencing another culture is incredible and this could be a once in a life time experience. I'm sure there will be times you could fake a headache, and do your own thing. And, who knows, you may actually have a good time!
If you decide not to go, can I go????