If you simply don't feel love towards family members, I can't begin to guess why. I do not know what your home life is like and what other contributing factors there may be to kill your love for them. Feeling attracted to the opposite sex and having the feeling drop away after days, weeks or a month or so can be simply new relationship energy which is a euphoric type of high, your head is in the clouds and heart does somersaults kind of feeling which is extremely strong from an over release of feel good hormones in your body. Eventually these hormones come back down to a more normal level at which we realize whether it was really love we felt or just the high of the hormones.
If you are able to feel something for a few days at least, somethings working, but perhaps your bodys ability to produce enough hormones doesn't work right and you may need medication for that.
There is a possibilty that you are depressed and have not yet been diagnosed. When a person is depressed, they tend to not have any feelings or desires. Again, hormone levels are too low for some reason, thus the expression 'depressed' meaning the levels are too low to function properly with.
I would suggest seeing a doctor to get tested.
This does not reflect bad on you. It's nothing to feel ashamed about. In fact I have noticed a trend of more people being depressed in todays world than any time in my past. So I believe its due to things present in todays environment (that were not around or not as bad in the past)
that may be contributing factors, and things we can't avoid. So if I were you, I'd go see a doctor. [ Dragonflymagic's advice column | Ask Dragonflymagic A Question ]
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