I rolled my ankle, it hurts to walk but there's no bruising but just a little swelling. did i sprain it?

Ankle : Sound like a mild sprain or a strain. Dont under treat these ive seen many that were treated lightly and ended up being a chronic issue i would have a podiatrist or orthopod take a look at the ankle and treat the area based on there exam . There are many structures that make up the ankle.

Yes: Rolling ankle=sprain to a foot and ankle specialist. Sounds like yours is a mild sprain and follow the rice method, rest, ice, compression and elevation.