Is it normal that i'm worried about the state of europe as an american

I've been watching alot of the news lately on the migrant crisis in europe, and in my honest opinion its terrifying. I can understand that those fleeing war must have a place to go, but why do people go past the already peaceful turkey all the way to the icy winds of Sweden in Northern Europe. I just don't get it, and the fact that many of these people have no interest of integrating into European society is even more of a problem. I just worry that perhaps Europe may no longer be the place it was 20 or more years from now. Alot of Migrants from these countries tend to have far more children than the average European or even the average immigrant from other nations, its quite probable that europe will no longer be European in the next few decades and that is always a cause for concern for me. Its not that i have anything against people from the middle east its just that its terrifying to see the cornerstone of western society ruin itself by doing this. Once Europe is no longer ethnically European, will it only be American, Canada and Australia left as the last western Countries? Once a group with a totally different culture is the majority will that mean our culture will change as well? how long will it be when my favorite artists like Ne-yo, Ariana grande and Rihanna are replaced Arabic songs and Middle eastern hymms. im an american i have no immediate reason to worry about whats happening overseas but it really bothers me, is it normal?