Am I at a healthy weight?? Should i lose/gain?

I am 5 ft 5.5 inches tall. I weigh approximately 115 pounds. Everyone says that I'm skinny. I have twig legs and arms yet i have a fat stomach cause that is where all my weight goes. I want to lose the fat in my stomach but im afraid if i do that then i'll lose weight all over and i don't want to do that. But then again i don't wanna just stop exercising and just get fatter. What do u think??