how to talk dirty to my S/O

I know my boyfriend gets turned on, when I dirty talk to him. However, whenever I try, i just start laughing because I think I look dumb or weird saying those things.... I guess I'm a little insecure. Ha ha.. And plus idk what to tell him. Can you girls tell me what you tell your boyfriend that turns him on.... So that I can try it with mine? Ha ha thanks.