Handlebars are very personal. If they are too narrow, your arms can close down your chest wall and make it harder to breath. Also, it can be harder to steer, as wider bars can give yo better control. Get new bars. If you got it new from your LBS, take it back and see if they'll swap it out. Otherwise, there are plenty of super cheap aluminum bars on ebay that you can get for under 20 or 30 dollars shipped.
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