Is it normal that when i'm angry i run around the house?

Like the inside of your house? You sound like my cat.

I think so. Some people relieve stress by working out. That's sort of working out?

People do different things to vent their anger and emotions. And yours is to run around the house. There's nothing wrong with it. Even if this way of venting anger may not be common , it's not problematic. At least you're not trying to start a fight or vandalizing when you're angry. As long as the way you vent your anger is peaceful and harmless, then it's fine. It's actually cool!