We are an creative and imaginative beings by nature. We fantasize about things which we cannot act upon in reality. Let's split the question.

1. What''s the difference between fantasy and reality in your opinion, do not tell me you have never fantasized about anything?

2. Does your imagination/or your fantasy influence your decisions in reality?

3. What do you think, is holding on to your fantasy would make you successful or embracing the reality and surrendering to it is the way of success?

I would have used dream instead of fantasy, but dreaming is a subconscious process which we do not have much control upon, but fantasizing is a conscious process where we purposefully/deliberately think that this thing could have been like this rather than that.

Another thing, fantasy here is not in the NSFW sense, it is more like reality vs your thought process or what you think should be real.

These quotes would be more helpful.