Is it so hard to think that my health is more important than other peoples feelings and how it effects me ?

Your health might not be your main focus, you should get at least one hour of excise a day at this day and age.  It depends on who you are to see if others feelings are more important to you, but just try to get in a lot of excise a day, and your friends are important at these days, but once you go to collage you reset with friends and popularity and once out of collage you may not have very many friends.  I am not saying to ditch your friends but I don't know what type of friends you have, but if they are not the friends that you want then try to focus on other things like your health. 

No matter what they say you can’t change who you are so when u tell them whatever they say jus be like i’m who i am and i won’t change

Why don't give me a problem to work with and i will you with the problem