Some people are musically inclined, they can learn easily and fast and they tend to the best. But most people require some level of training complimented by the dedication of what amounts to mostly self-practice. So in a way, you're self taught.
The vast majority of people are willing to buy an instrument, just to see if they are musically inclined, but when they find out they aren't they don't have the dedication to do it the hard way.