Terrible and presumably unique problem I have with girls

I have this problem with girls and it is really freaking me out. I've searched the internet and haven't really found anything similar, so I'm calling on anyone who can saying anything relevant/helpful. It's pretty simple. I'm a guy in my early twenties and I only find girls with big boobs attractive. This problem coupled with a crippling inability to converse with girls like other normal men means I essentially have little hope in my love life. Never having a girlfriend or even any intimacy with a girl is a problem in itself, especially at my age. Then there is the other previously mentioned problem. Lets imagine me and my friends are out somewhere, say a pub or on campus somewhere at uni. You see girls all the time, mutual friends, acquaintances etc. So my friends might comment on girls they think are attractive, I might say "yeah she was fit" or whatever. But in my mind I am thinking I wouldn't give her a second look because her chest isn't big enough. She isn't fit because she has average sized breasts. You can understand how this is a problem. Firstly it makes me sound like a pervert (maybe I am), and secondly it drastically reduces the amount of possible partners for me (from an already small group I'm sure). I don't consciously try to only like girls who are well endowed, it's some kind of unconscious mechanism inside me. I would love to like girls of all shapes and sizes, but I can't. I'm not great at estimating cup size but from some research online I guess I would like anything from say DD or E cup upwards, I don't know what the max would be. What I can say is that I wouldn't like comedy sized breasts that you are probably imagining, there is an upper limit. Anything that would appear in Nuts or Zoo magazines is probably my cup of tea (I feel like some kind of sex pervert saying that). What makes me upset and has actually brought me close to tears sometimes is that if I was offered the perfect girl who was intelligent, pretty and shared interests; I would have to check out the eyes on her body before the eyes on her face. Who can you talk to about this? My friends would think I was odd, girls would consider me some kind of maniac pervert and I doubt a doctor could even identify a problem in medical terms. And I do think this is a medical/psychological problem. What am I supposed to do, forever stay alone because the chances of me finding the right girl are so slim? Then I would probably feel guilty because I would question my motives in liking her. Additionally I don't think this is something I am going to grow out of, I'm in my early twenties now.

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