I am thin, will running make me thinner?

I am 27 years old and thin, I almost weigh 55Kgs and my height is 5 feet and 6 inches. I look to be very thin. I am planning to start running in a few days, but some of the folks around me are of the view that running will make me even thinner and I will not look good, what do the experts say about it? Will running make me even thinner or what?

Thank you