Worried

My son's first adult tooth is already growing in but his baby tooth is still there. It's been two weeks and he couldn't take it off. I don't know why he couldn't take it off  I think he is scared. The adult tooth is growing at the back of his baby tooth and it looks horrible. If he couldn't take it off I think we are taking him to the dentist. I can't believe that all of their new tooth grows first before the new one comes in.. Haistt whatalife!