What Do You Do?

What do you do when you thought of something good but eventually turned out to be just a wishful thingking?

I tried to fight the feeling, but I still fell.

Or is it all my fault? When there was never really a possibility in the first place, I still hoped.
Is it all because I expected too much?

Should I just carry on with what is going on, or on what I have at the moment?

What if it makes me happy? What if this feeling gives me joy?

I think I'm getting crazy.