Seriousley, they are just jealous of your talent. I personally would talk back to them and say:
-at least I am learning to do something. How can Social Studies help you in real life?
-can you make something out of wood? No? I thought you couldn't anyways.
Or if you are kinda shy you can:
-study harder and get good grades win a few awards this is a fool proof way.
-enter your wood work in competition and then have your school announce it.
YOU ARE NOT DUMB! Scientifically speaking it takes hand eye coordination, imagination, and attention to detail to do wood shop. Not everyone can do it. You have quite a skill (seriousley if you gave me a piece of wood I would screw it up soo badly)
Hope this Helps