Adoption is my plan A? Is this morally strange.?

Due to the fact that you've actively tried for a baby naturally, adopting is actually your plan b. That's a very normal course of action and it's curious that you think that you are the only infertile couple in the world to go straight to adoption. You don't have to say anything to anyone about it as it's non of their business. IVF and IUI treatments are less common than you are giving them credit for.