No, it does not. You might be feeling depressed because of the particular attributes of the object of your love and not the general characteristics of the opposite sex. That is one thing. Another thing is that when you are falling in love, you usually do feel attraction, so it cannot be said that you do not feel any attraction for someone from the opposite sex.

No. It is not normal. Think about it - if everybody who was thinking about having a relationship with the opposite sex felt condemned, a lot of such people would not enter into relationships with the opposite sex - the humankind would then cease to exist in a few generations or so.

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Your writing is a bit labored, probably because you are writing in English and not Portuguese. What you wrote appears strange, but it could be just because of the language barrier. Maybe if you give some examples - rather than asking very general questions - we'd be able to see your situation more concretely and in detail and provide better help.