Sometimes when you are beginning, it’s hard to know what terms to search for in the forum for the techniques and workflow required.
You would want to look at “cut outline” or “trace outline” in the forum posts. There are several tutorials in the Tips & Tricks that walk you through using a trace feature in design software to get an outline of the bitmap shape.
You have run against a fundamental distinction in digital design: rasters/bitmaps versus vectors/paths.
As @Jules would note by asking you about what design program you use, the technique is similar for all design programs, but the terminology can shift from one program to another.
In Inkscape you would open the bitmap, select it, and then to a bitmap trace. I’d use edge detection.
You would then clean up the vector outline by breaking it apart/ungrouping it, and then take out the inner vectors.
There are other workflows that make it easier to trace and just get a single outline, but for a quick outline, this works great.
Right click to download.