My bf loves going down on me!

idk why he just loves to do it, I'm so insecure about myself like I might taste bad or I might smell even tho I shower everyday , he just loves to do it and i try to enjoy it i really do and he also likes me doing it but I don't think I'm good at giving head so I dont really do it ...he tells me he loves it but I don't think soo ...I really want to learn how to give good ass head ! lmaoo any TIPS ladies?!