No lack of verbal fingers. But you get an answer, too. Draw it. Keep a copy of your shape as reference. It's tracing, but manually. The pen tool is not necessary in this case. Probably you learn something about the path anchors and their control handles. Without that knowledge the Pen is nearly useless.
Your shape was be copied and pasted to Illustrator from your question.
Here's how to do this with the pen tool. No tracing, no shapes, no pathfinder, all of three points required.
Drop your image in AI and lock it so you don't accidentally select it.
Create the three points and close your path by clicking the first point again.
Convert all points to rounded.
Drag the handholds to give the bezier the desired curve.
- Unlink the bottom handholds by holding ALT while dragging them.
Fill your shape with the gradient tool.