<human>: Can you succinctly summarize the text in 1-3 sentences?

Hey, r/relationships. I need some help.

Relatively new relationship for me (around 1 and a half months). We are both 18 going on 19 college students. This is my first 'Facebook official' girlfriend in a long time. I've been dating girls quite often but I hadn't actually made one official until now.

This girl is gorgeous. She's cool. She isn't whiny or needy. No complaints about the sex. We have similar interests. When we're together we're having a good time. But for some reason, I'm just not 'feeling' it... That's the best way I can describe it. 

I don't know what's wrong with me. Is something wrong with me? Is this normal? Have any of you experienced similar feelings with new relationships? Because, I feel like at this point I should still be feeling butterflies and thinking about her constantly. But there was like a 2 day period where I almost *forgot* I was dating her. That doesn't seem right to me.

Should I stick it out a little longer, or end it? Furthermore, if I *do* break up with her, how do I explain this without sounding like a total and complete asshole? Because I would feel like *such* a dick doing that.

Thank you.
<bot>: In a relationship with a great girl who has everything I'd want, still not 'feeling' it for some reason and I don't know why.