You will need to find a protein supplement that is acceptable to your diet, probably a soy protein powder. You also need to take a multivitamin if you don't already. These two things will help a lot with body building given your current nutritional needs.
You need to find a way to get a lot of protein into your diet. You should try eating tofu or other meatless items that contain protein. Without protein your body will be very brittle.
As a vegan who wants to be a bodybuilder, you absolutely need to get enough protein. You can do this via natural foods like beans, nuts, and soy products. You can also supplement with soy protein powder if you so desire.
Make sure you get enough protein from your diet (50-150g per day depending on how much exercise you do) from beans, peas and tofu. You can also buy protein.
