Lately I've been having the urge to book our summer vacation before we agreed on it.
What makes you want to book the vacation without taking to your partner?
Because I'm disorganized and I often forget about essential things
Each decision you as a couple can successfully make together brings you closer to each other. Your partner also had their own right to decide for themselves but they were not allowed to make decision for thier own.
I don't know what I'm doing. I would go cry if she gets mad at all of this and stops wanting to be with me or work with me. I love her so much and I can't possibly live without her.
Well if you feel as strongly about working together that's even more reason for you to communicate with her about the vacation. Just find time to sit down with her and get it all planned out, it's as simple as that.