Im 18 with anxiety about my heart my bmi is obese however i am not only fat i have muscle since i used to workout a lot but after back muscle pain and hip pain i have not been active and worry about my heart, should i worry or is it just anxiety?

It is unclear what symptoms you are having that have you concerned about your heart. You should see your doctor to determine if a cardiologist should evaluate your heart, depending on what your symptoms are and what physical exam findings you have. Good luck!

Your post does not describe any symptoms that would suggest a heart issue & these are quite rare in someone your listed age. Heartburn from stomach acid backup is the more common reason for "chest" pain as the location at the stomach entrance is just behind/left of the heart. Discuss your symptoms with your doc. An exam & testing can exclude worrisome issues & lead to treatment.