Vanderaj, you have to organise your life round your physical and medical limitations, I suggest. If you can't fit into the one seat the airline YOU choose to fly with provides then buy another. Do you buy your shoes and clothes too small just because they are cheaper in a smaller size? Probably not! You have certain physical attributes which may be genetic, medical or diet related. It is unfortunate for you but why should your fellow passengers have to suffer because of your physique?