So I was wondering I'm a level six rogue and I dual wield two short swords. Can I dash with Cunning action, attack with with my normal action, then attack with my off hand weapon since I have Dual Wielding?
No, you only have one Bonus Action a round.
Using your cunning action to Dash uses your Bonus Action. Attacking with your off hand weapon also takes a Bonus Action. Only one Bonus action per round so you would have to choose which you wanted to do.
The Feat Dual Wielding allows you to use two non-light weapons, but it still takes a Bonus Action to make the attack.