The speaker is a rock talking to someone who once picked it up and carved it into something new. At first, the change sounds like a gift: a plain, shapeless stone becomes a finished piece of work. But the last two lines undercut that hope. After all the effort, the sculptor decides the result isn't wanted and throws it away.
What stands out is how little the speaker says about the pain. The language is short and flat, which makes the hurt feel quieter and more believable. The speaker seems to have trusted this person, let them reshape everything, and then been discarded once it no longer suited them.
The title, "Fallen angel," and the label "Rock" suggest the speaker may be using the rock as a mask for a person. Judging by the tone, the poem reads as a lament about being used, changed, and abandoned. The mood is sad, bitter, and a little resigned.