Am I the only one..?

Okay so I’ve been dating this guy for a while & we have sex a lot... lol but anyways when he is down there or fingering me i get this feeling which I can’t explain but I always end up pushing him off. It happens all the time! I don’t think it’s a orgasm because aren’t they supposed to feel good? I really just don’t know how to explain the feeling but when I tell him to stop he wont because he thinks it’s an orgasm. I usually end up pushing him off but we keep on going... am I weird or..? Does anyone else relate on the feeling I get?