Something people need to realize is that we're all built differently. Some of us gain in our bellies and some, like me, gain in our butts.
If your Dr. gives you a clean bill of health, tell your friends to lay off.
My best friend was built like you, skinny legs and arms and large middle and rib cage.
115 seems like a good weight for your height. You probably shouldn't lose any more but be careful junk foods.