It sounds like you two have pretty different needs, she seems to need alone time, and you like together time- a lot more often.
If you two talk about it you might find good compromises so you don't hurt each other's feelings.
Relationships can be ok when people are different this way, it's about knowing and respecting each other, communication in a rational caring way, and compromises that keep things balanced.
You don't have to be scared about it, this is a good time to learn about who you are in a relationship. And what you want and need, and same for her.