Hello, I can totally understand your concern and how you must be feeling.
Whatever nutrition we give to our body get absorbed in the body parts depending on the movement of that particular part.
Love yourself, take good care of yourself, don't worry about what the others will think. Those who love you don't need any changes to accept you and those who don't, won't accept no matter what you do.
To feel confident and secure, you must first start loving yourself unconditionally.
Next Steps
You need proper diet and focused exercise.
Health Tips
You can join a gym if you want with a proper instructor.