Kissing with tongue

Does anyone else have An issue with tongue action while making out.? I don't know why but I just can't do it .. Tongues gross me out but it's something my boyfriend always does.. But to me it just feels like he's shoving his tongue in my mouth.. I've always though tongues are gross. For some reason. But my boyfriend really likes use his tongue while making out.. He has asked me why I never do it back.. Does anyone else have this issue . Do you like Making out with tongues or is it not that common ?