![I want to join those with Envelope Distort](https://i.stack.imgur.com/KcAv4.png)

I'm trying to wrap the lines within the shape in Illustrator. The lines are in a layer under the shape. When I use Envelope Distort to do put the wrap the lines with the shape it returns this:
![Not what I want](https://i.stack.imgur.com/3oNrZ.png)

This is not what I'm trying to achieve.
What am I doing wrong?