I don't think it's normal, to be honest, but I do think it's a choice whether or not you want to change it. And if you don't, the good thing is, you can find a partner who feels the same way as you, if you want a partner at all. Here's such a site:
http://www.asexualove.net/
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Maven
If I had a dollar for every time I got distracted, I wish I had some ice cream.
Equal Rights Are Not Special Rights