Is your hair straight but flat and dull?

My hair had always been straight, but very thin, flat and dull. This always annoy me that there're times that I perm my hair just so that it'll look thicker. However, I've just accidentally discovered a really inexpensive way to make my hair look thicker & bouncy but still straight. I just came back home, and there was only a bottle of shampoo for curly hair (I used it when I had permed hair). So, out of desperation, I just used it anyway. The result was marvelous! After washing and blow drying my hair, my hair looked bouncy, alive but at the same time straight and silky!