Not every girl will find it odd you want to talk to her just because you find her attractive. Just give it a shot. You don't always need a reason to talk to someone.

For example, my boyfriend actually started talking to me because he said he thought I looked like an angel. It was only until later we began to find real interesting things to talk about which I think can be good upon trying to talk to someone new.

You never know if someone will find you awkward or creepy, also it could just be a thing you're overly anxious about and in reality you're not coming off as awkward or creepy to the person you're talking to. Just don't think about how your negative feelings but more about "hey this person who I'm really interested in is actually talking to me, sweet".