only seeing my flaws

I have a colleague who is extremely thin and doesn’t eat much. She smokes as well.
I have been trying to lose the last 10 lbs and I still feel fat despite having a healthy mid-range BMI. I am significantly taller than my colleague but I think I just have a bigger frame over all. I feel jealous and when I look at her, I always felt her outfits somehow look so much better than mine because of her small frame, even though I am also quite stylish according to other people.
I just feel like the jealousy and the comparison are causing me lots of distress at work and somehow I feel like this person is jealous of my height too which even exacerbates the situation. What should I do? Should I keep losing more weight so I can be more thin and tall at the same time so I can feel better?
I really need help!