I think I'm going to shout at my girlfriend after she rearranged our apartment without asking my opinion
Why are you going to yell at your girlfriend?
No special reason, I'm just tired of her not asking my opinion before doing things she likes.
You shouldn't yell at her like that. Have you tried talking to her to let her know how you feel? Maybe she doesn't realize that this is upsetting to you.
Don't worry I won't hurt her and I love her.
But what you said earlier is something that could harm her. I believe if you're feeling frustrated, you should just take time off for yourself so you don't take it out on her. How about going to an anger management class together, the both of you can learn lots there!