i am rahul. i have just passed out of 12th and don't know what to do . i don't want to do engineering but my ultimate goal is to join army

i am a non-med student but not a successful one . i am not able to find my passion in engineering. i was a weak student in school. i am somehow unable to understand my callibre .my ultimate passion is to join army but don't know what course to do meanwhile .... please help!