The blues may not be everyone's cup of tea... but there's no arguing that it is bedrock for much of the music we play. Classical as well, if you think about it. Like shredding? Turn down the volume - it's essentially classical guitar. That may or may not mean anything to you. The short answer is this: sit down with your instructor and tell him, "I appreciate your efforts, but this is not my focus; this is not my passion." Let him know what you want to learn. If he's neither willing nor able to shift gears, be nice about it and find someone else. I can nearly guarantee that when you want to expand your horizons, though, you'll come back to blues basics and learn the techniques. Good luck.