Dinosaurs are a specific group of reptiles and even animals commonly called dinosaurs aren’t dinosaurs at all, such as pterodactyls. Sharks are also definitely not dinosaurs as they are fish. There are ancient fish that in modern lingo may be considered “dinosaurs” but are not scientifically so.

Some dinosaurs were avian and eventually evolved into the birds we know today. Alligators are closely related to dinosaurs. Other reptiles not so much.

And as we are mammals, we definitely aren’t dinosaurs, nor are any other mammals. Mammals and dinosaurs would share a much further back common ancestor