The regular seasonal flu shot is “intramuscular” which means it is injected into muscle (usually in the upper arm). It has been used for decades and is approved for use in people 6 months of age and older, including healthy people, people with chronic medical conditions and pregnant women. Regular flu shots make up the bulk of the vaccine supply produced for the United States.
The high-dose vaccine is for people 65 and older which also is intramuscular.
The intradermal vaccine is for people 18 to 64 years of age which is injected with a needle into the “dermis” or skin.
Are you sure you can't get the flu shot? You can't get sick from the flu shot, that's just a myth...but if your doctor doesn't recommend it for some other reason then I understand.