You're not overweight, man.
Statistics show that when you get older... and let's face it, we are... skinny folks have a lower life expectancy than people that carry a FEW extra pounds.
I read that on the internet, so it has to be true, y'know? The same article said that, when you reach age 60 or so, if you aren't obese, adding 10 pounds a decade doesn't hurt your chances of survival... if all other things like exercise remain normal.