One thing I think a lot about is how my fantasies relate to my reality, or in what way they should relate to my reality. A great many people see their fantasies as an extension of their real life, things they fantasise about are things they are planning for or want for real. In one sense it has to be like that. What I fancy in my mind has to come from my desires and wants to some extent or fears that needs to be addressed. They come from me and I am real and so they relate to reality.
On the other hand it is a great thing that what happens in your mind does not always become reality. You can express anger and even hate but you don't have to act upon it. You don't have to go killing someone just because you have fantasies about that. Those thoughts may come from great anger and fantasies may function as an outlet rather than as a planning stage.
Fantasies, wild and strange, are an inspiration for stories and daydreaming and that is something I enjoy. In fact I have come to realise that the thought of having to realise my fantasies hampers the free flow of thoughts. If I let my mind be thrilled with the thought of a cruel whip or something a little more brutal it scares me if that has to become reality. I then try to control my fantasies to include only doable and nice things. That is not very good.
At the moment I think I prefer to have reality, boring and ordinary, in one place and wild and strange fantasies in another. And enjoy the free flow of thoughts.