Is it normal for your ankle to buckle

I never sprained, broken or harmed any part of my body. At most bruised or cut it a bit because I'm clumpsy. For the past few years I just walk and next thing you know I end up falling. My ankle bends to either side and I fall. It's really embarrassing, does it happen to others? It's like it can't keep me up. I'm 125Ibs, and 5'7 so I think it should be able to lift me....