An x-ray is the only way to know for sure.
I have heard that ligament tears are worse though as far as healing.
I had a serious sprain (and no hyperbole..literally any lightweight thing such as a feather or a piece of paper could not touch my foot without me being in excrutiating pain!).
My parents never took me in, but based on my recollection of the injury, I am told that most likely I tore some ligaments. I couldn't move my foot or anything, could not place weight on my foot, and it could not be touched without hurting.
The next day, I could not walk at all--so could not go to school and my parents refused to take me in to see the doc.
So--being that school was my refuge, I spent that day learning how to suffer on that foot.

It was an all day effort and I have no idea how I did it. I borrowed an old crutch of my mom's in the garage that was way too big for me. (Took it to school only once and it was a disaster). And I just did my best on that foot.
Go get your foot x-rayed and treated, please.
If you can't walk on it--you can't walk on it. You can't know if it is broken unless you are Superman and have x-ray vision.
The good news is that walgreens and such sell crutches, so if you choose not to go to the doc and still can't walk, you can pick something up to help you walk.
But my recovery sucked and I had people who had no business providing medical advice and too lazy to take me into the clinic that caused that.
My foot did eventually heal, though it did have some issues with weakness. A high school student I met as an adult was doing these silly exercises when we did a play together for strengthening the ankle...spelling the alphabet backwards and forwards (no skipping letters) and that did help a lot. But you can't do that until the foot is healed.
Follow RICE in the mean time. But get it x-rayed when you can!