My Boyfriend NEVER GOES DOWN ON ME.......

My boyfriend always asks for a blow job, and even when he doesnt ask, I still do cuz i wanna please him. He went down on me a few times. But he only lick my clit, never puts his tongue all the way in or sucks on it. He has this look on his face like he is disgusted by something. So i dont ask anymore. He made me so self conscious, im asking myself questions like, "am i the first girl he ate?" , "Does my vagina stink?" , "Wtf is wrong with me?" its really making me emotional and worried. Am i the only one? Do you guys think there is something wrong with me ? & if so , what could it be?