I dont know what to do?

my boyfriend gets upset wih me sometimes because i am non shalaunt. and i told him i couldnt help it. its just how i am. he says that i can help it. he just thinks im hiding my feelings from him. and im very sarcastic. which also bothers him. and thats something i told him that i couldnt control but this is something that he also thinks is controlable. and i really can control these thngs.?