[28/M] The path ahead is clouded...

Welp. I feel pretty stupid right now and am at a bit of a loss. Met a girl a few weeks ago through a mutual friend, she made it pretty clear that she's interested in me, we spent a couple weeks texting and FB messaging as I was working out of town. I was all excited, arranged a date last week, it went good so went on another one last night, which also went really well. She's nice, pretty, and intelligent, and I do enjoy spending time with her. We laugh and have great conversation... but as soon as we part, I feel like I'm not attracted to her, and her (perceived) flaws come rushing to the forefront of my mind: she has a negative attitude, she has poor posture, she's too short for me, she interrupts. To make matters worse, I realised that I'm still hung up on another girl - pretty much my dream girl - who's already told me she'll only ever see me as a friend. Stupid, right? I thought I'd come to terms with that and moved on months ago. Nope. I'm mentally comparing her to the current girl.

I like this girl and really want to give her a shot, but the only time I feel attraction is when we're together and I think that's due to my own insecurity and need for physical contact. The rest of the time, responding to her feels like a nuisance, thinking about her conjures only her negative traits, and I worry that if I follow this through I'll be settling just for the sake of having a relationship.

TL;DR: I want to like this girl, but I don't feel attracted to her, in part because I'm hung up on someone else.

[Edit] I hung out with her again, confirmed that there is no chemistry, and called it off.