Are your fantasies very similar to your actual sex life, or very different?
For examples of very different, some fantasies might be things you want to imagine but don't want to do (such as a person who likes watching watersports but doesn't want to touch it in real life), or might be things that are impossible in real life (for example, if your fetish is aliens or vampires, the closest you can get is role-playing) or might be things you intend to do but haven't managed to arrange yet (such as 10+ person orgies or sex with celebrities).
For examples of the same, I think that's self-explanatory. You get off on fantasies of things that you actually do.
For examples of very different, some fantasies might be things you want to imagine but don't want to do (such as a person who likes watching watersports but doesn't want to touch it in real life), or might be things that are impossible in real life (for example, if your fetish is aliens or vampires, the closest you can get is role-playing) or might be things you intend to do but haven't managed to arrange yet (such as 10+ person orgies or sex with celebrities).
For examples of the same, I think that's self-explanatory. You get off on fantasies of things that you actually do.