More info might help. You said you were 11 so that is great that you are learning at an early age.
I am guessing you got the egg mail order ? maybe a clutch of 3 ? I have seen them offered this way.
Do you own other Chams or reptiles ?
If you want to keep Chams at age 11 you will need parent support. I am kind of guessing you have this.
As mentioned not all eggs will hatch even if fertile. Infertile or dead eggs mold. So it likely was a fertile egg. However even though everything you read makes it sound simple, there is a lot that can go wrong. This is not to discourage, but rather build hope. It is a learning curve, but very doable. I am on the same ride. I have kept many animals over the years, but this is my first venture into breeding.