tell that to the art teacher who encouraged me to drop the class!
Well, that doesn't sound good...lol........or it could be that he just wasn't a very dedicated teacher.
I really believe anyone can learn and with practice can produce some very good work, it may be a little harder and a longer path than someone with natural ability, but if its for your own personal growth, that is OK.
Sometimes teachers try to cram all the color theory, perspective, light source, etc... In to fast and lose students who need to learn and practice the very basics.
Sometimes art teachers forget the basic shapes are the building blocks of art....... Davinci himself beat out all the artists in the country for a contract by drawing only a circle......