Why do I see almost every girl as 'girlfriend material'?

I hate this thing where, if I'm not seeing anyone or things are going well with someone, I automatically look at every girl as if she could be my girlfriend. I hate it. If it's going well with a girl, I turn this off and I hardly notice girls past anything but friends. Yet if not, I almost evaluate them, see if they're nice, whether they're into the same things as me etc. and then think about them and whether I should I ask them out. I haven't had a proper girlfriend for a while now, and I guess this is why this is happening. It's the same with some of my close friends, a few have long term girlfriends, a few don't and the few who haven't are like me, we would like girlfriends and they talk a lot about girls they've met and so on. I feel this is harming my actual chances with a girl, because I am not a sleazy person who just wants to sleep with them, I want a decent thing with someone. But, I can't just switch it off, that's the problem. The past few months have been fine, I have just spoken to girls as friends, yet everything recently has gone bad and now I am in the 'rut' again. What can I do? Thanks.

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