Im weight 140 im 5'3 1/2 tall im a female with a medium frame i use to weight 240 i lost 100 pounds in 7month do you think im overweight? keep going?

Doesn't matter: What i think. What do you think? You've done a remarkable job with your weight loss. Are you comfortable with your current body, or do you want to lose further. You are still slightly above your ideal body weight by a height/weight table, but bmi and potential risk profile are relatively normal. The biggest thing is not to regain the lost weight over time. Good luck!