i'm not sure if it's relevant, but i've been in similar situations and realised two things: if you work out nothing is likely to happen, you start to see more friendly things in that person and less idealistic romantic stuff. second: if you really like someone it's better to have them in your life as a friend than not at all.

i don't think it's a question of getting her out of your head completely, maybe just re-evaluating hoiw you see her, why you see her this way and how much you would be prepared to compromise on not getting everything in order to ensure you keep something.

whatever you decide, good luck x