The speaker is begging someone to make them feel good, even though they know that person won't stay. Every line starts from a plea: make me smile, make me shine, make me forget. The wish is simple, almost childlike, but it comes with a painful catch. The speaker already knows the love isn't going to last, and "Even if you won't be mine" admits that outright.
What stands out is the speaker's honesty. They aren't pretending things will work out. Instead, they ask to be distracted from the truth, to forget the coming departure for a little while. The last line, "my heart can't breathe," makes the hurt physical, as if the sadness is already pressing on the chest.
The mood is quiet, tender and a little desperate. Short lines and repetition give it the feel of someone whispering a request they're half afraid to say aloud. It captures the ache of wanting to enjoy a moment while knowing it's ending.