I'm 19 male and taking tbomb a testosterone optimizer will that cause infertility. It is only a optimizer?

Hard to say. I looked up the ingredients. Here's two main problems I have with what you're doing. First of all at 19, your t level is probably the highest it will ever be naturally. Why mess with it? Secondly, that product says proprietary blend of (bunch of herbs). It doesn't break down the dosages of each, I have no idea how much tribillus is in there vs others.
Testosterone. Not sure about what is an optimizer, i will consult with your doctor probably you will like to show the composition of the substance that you are taking to be safe.