Grasshopper22,
The only way you should feel bad is if you had to pay several months of tuition for your current school, and switching would mean you paid all that money for nothing. But in that case, the only thing being hurt would be your wallet...not the teacher's feelings. I am sure he is used to students coming and going. Seriously though, I would say go and sit in on the kung fu class first before you make a decision to switch. Good luck!
The only way you should feel bad is if you had to pay several months of tuition for your current school, and switching would mean you paid all that money for nothing. But in that case, the only thing being hurt would be your wallet...not the teacher's feelings. I am sure he is used to students coming and going. Seriously though, I would say go and sit in on the kung fu class first before you make a decision to switch. Good luck!