What wrong with me?

I (M19) was talking to a girl (F18), (very nice girl, chill and all) we work at the same place (for abouth a months now).
She invited me to the club but im not the type of personne to go there. But still i did for her. She did have fun, me not much but still.
Anyway, i did take a drink so i din’t go to my house after. I sleep at her house. In her bed. (Nothing happened)
The next day i wasnt able to sleep. So i texted her and she told me : tell me what wrong, i will read it tomorrow.
And i did, i tell her that i hate the fact that i fall in love so fast with people, and all kind of other stuff.
And she told me that she understand but that she dont want any relationship right now.
But i din’t tell her that i loved her.
But she complemented me, that i was the perfect men and all stuff.

Anyway, i got friend zone without asking her out…
Wtf is wrong with me?