Not using shampoo?

When I use shampoo on my hair, my bangs, the most important part of my hair, become flat and lifeless, they really look ugly. So to avoid this I am not using shampoo as much when I shower. This helps, actually my hair appears better the longer I have gone without using shampoo. But, obviously my hair gets itchy without it. What can I do so my hair does not appear so flat after shampooing? Is it the shampoo? Is there a process I need to go through when washing my hair? I am using Suave "volumizing"  that I got from the supermarket.