If I had the chance to do it again, would I have gone to art school?
For one, I would have a gigantic ulcer right now from the stress of doing what the teacher wanted, and not what I wanted. I never liked being told what to read in English class, even though I'm an avid reader, so being told what to draw/sculpt/forge would not have set well with me. I never did well in classes in which I had no interest -- I'd do what I needed in order to pass and be done, but if I'm not inspired by the subject, it's nearly impossible for me to do anything really awesome. That would have made it really difficult for me in art school, because I have zero interest in painting bowls of apples or making a ceramic pot.
If you want to be an artist, whether it's a watercolorist or lampworker -- go for it. If you think a class would benefit you, take it, but never let a lack of formal education get in your way of creating. Creating comes from the heart, and no one can teach that.