The scale is a particularly poor measure of whether physical activity is improving your appearance. Lean muscle tissue weighs more than fat, but takes up less space. Don't buy into media images. Remember that ads are meant to sell you something. Be alert for mixed messages.
Many people eat when they feel stressed, angry, lonely, depressed, or disappointed.
Find other ways to nurture yourself when you feel down. Eat healthy meals at regular times. Focus on what you like about yourself and your body. Value your body for what it can do, not just how it looks. Consider seeing a psychologist or counselor.