Everyone has different body type. I would not bank to much on other's opinions. I am 6ft and 140lbs and people say I'm "too skinny" (which I'm not). In my opinion, if you are unhappy with how you look and what to loose weight, go for it! If you are comfortable and happy the way you are, you do you! It's all about confidence in your own skin.
Its personal opinion. You may feel amazing at 105 ans gross at 110. I am 96 now and I am quite happy here. At 90 I feel too thin and at 100 I feel grossly overweight. It is all about how you feel. (I am 5'3 also btw)