Definition & Meaning of "just my luck"

What is the origin of the idiom "just my luck" and when to use it?

The phrase "just my luck" is an informal idiom used to express a sense of disappointment, frustration, or resignation when something goes wrong or an unfortunate event occurs. The origin of this phrase is not precisely documented, but it has been in use for a long time, reflecting the common human experience of encountering unexpected problems or misfortunes.