Yes, I'm sure just about anyone can feel their lymph nodes, even if they are not swollen. You just have to feel deep enough in certain areas. Heck I don't even know all the areas that the lymph nodes are in, but I know there are alot around your neck. If you doctor had found them and you hadn't, more than likely they aren't that swollen. As for normal size, I have heard they are usually about the size of a pea. If you have been sick, it's quite possible your lymph nodes had swollen a bit from the infection.