<human>: Could you distill the essence of the text into 1-3 sentences?

I can't masturbate to girls I like. Let me rephrase that. When I'm really into a girl, I find it difficult to have sexual fantasies about her. I just can't envision her naked or anything.  However, other attractive girls that I know work just fine.  I find it ironic that I can fantasize about girls that I have no emotional desire for but not the girl that I'm actually into.  What i can do is imagine romantic crap like dating and cuddling, even kissing. But no sex.  Additionally, I can't fantasize about girls while I'm into them, but when I get over them and go on to liking either a new girl or nobody, it works.  Is this normal?  Does anyone else do this?  Or is this a result of psychological problems(I'm a tad fucked up)?
<bot>: I can't masturbate to girls I like, but i can to girls I don't. What's wrong with me?