Did you know that at some time around the age of twelve you brain gets "stiff"? It actually does. When that happens, it gets harder to learn new things. And actually, the average person loses about 10 I.Q. points in a lifetime, although this is made up for with experience.
This means you are at the best age to learn a new language than you ever will be. Don’t be scared. You can do this, and it is worth the effort.