As the others have said, you're a healthy weight already however it is your body and whilst 18.7 is low, it's still within a healthy weight range. You say you're quite broad shouldered and muscular, it sounds like you have a medium build size so at 119lbs at 5 ft 7, you may actually look a bit bony. I'm not saying you need to lose weight (you don't!) but if you want to, may I suggest taking some photos of yourself as you are now, then just lose 5 or 10lbs, take more photos and compare. 24 lbs is a lot of weight to lose (nearly 2 stone!) and given that you're already a healthy weight, a difference is likely to show with smaller amounts of weightloss