There is no way a level 1 player in Skyrim could defeat a mighty dragon.
However, you will end up running away from the dragon, considering how weak your character is at the time. Once you play Skyrim, you will face an opening cinematic that leads to you fighting a giant dragon that breathes fire. If you want to compare Skyrim and Fallout 4, you need to compare Skyrim vs Fallout 4 map. This incredible RPG game focuses heavily on many brilliant things, including conversation, combat, and exploration, which you will be able to do quite a lot in the game. In Skyrim, you will play in a fantasy world called Tamriel.