You'd be floppy like a beanbag. Without bones you'd be just a puddle of skin and guts on the floor.
Bones have two purposes.
Some, like your backbone, provide the structure which enables you to stand erect instead of lying like a puddle on the floor. Other bones protect the delicate, and sometimes soft, insides of your body. Your skull, a series of fused bones, acts like a hard protective helmet for your brain. The bones, or vertebrae, of your spinal column surround your spinal cord, a complex bundle of nerves. When you were born you had over 300 bones.