Try different study techniques too. I day dream about shit too lol, comes with the ENFP territory (though I don't have ADD). Have you tried starting study groups? It really helps keeping extroverts focused you know? To be honest, the best thing for anyone is for them to follow their heart, do what feels right to them. Society strives on having a range of talents, not just people who can succeed in the typical studying environment. I say give school a second chance but if you're still not comfortable after all that, you need to sit down and have a real heart to heart with your dad, standing firm in your lifestyle choice.