Im thirteen years old and ive been playin for just a few months. I find myself rather addicted to it. Yet i havent gotten around to taking lessons. My guitar is acoustic.I can play through random scales that friends have shown me (though i dont know the names of them), and a few licks that i got off of the internet. But when im goin through the scales and licks, i dont know what notes im hitting. Is there and easy formula that i can use to figure this out??? Also... circle of fifths??? Can any explain?