This
link has a couple of great images of Betelgeuse.
It says it's one of the largest stars we've found, and it is. That said, there are stars much bigger. VY Canis Majoris is several times larger and considerably more mass.
Here is an image that compares not only our Sun to VY Canis Majoris, but even the Earth's orbit around the Sun compared to the sheer size of VY Canis Majoris.
The Sun is just a small dot in comparison.
The Sun to the Earth is 93 million miles, so the full diameter is over twice that, yet the Earth's orbital circumference is only a small fraction of the size of VY Canis Majoris