I don’t know how to tell my girlfriend that I’m asexual

I’m 20f I have never dated anyone before her and I’m figuring things out, those things being that I am asexual and I’m not ready for a relationship.

I am awful with social cues and I didn’t realise how fast we jumped into a relationship (it was a month after we met).
I already don’t like hanging out with people, I’m always too mentally drained after a hangout so I don’t have the energy to come up with the right words for what I’m feeling.
Now I feel stuck not knowing how to tell her that I’m asexual, it makes me sick when we kiss. I don’t feel as if I am ready for a relationship

I don’t want to hurt her feelings

https://redd.it/1x1gka9
@asexualityonreddit