Is it normal if i don't like dancing with my boyfriend?

Ive always had this thing where I feel awkward dancing, as in grinding or doing anything sexual like an "act" while were hooking up, with a bf of mine. I don't know why, when it should feel comfortable for me because hes my dude, not some creep. BUT, I rather do all of that with a stranger, it just feels better and more fun. If I even try grinding on my bf, Ill start laughing and it won't be as seducing or attractive as it usually is if it was with some strange guy. It feels all awkward and lame.