Hello Applicant,

You can do one of the two things -

• Diploma in Automobile Engineering is a full-time 3-year Diploma level Automobile engineering course. Automobile engineering is the sub-branch of Mechanical Engineering. Candidates who have completed 10th examination with 60% marks and mathematics and science as main subjects of study from a recognized board are eligible for Diploma in Automobile Engineering course.
• Complete your 10 + 2 and go for automotive engineering. You must have completed 10+2 with a minimum of 60% marks in aggregate with Physics, Chemistry, and Mathematics or Biotechnology, Bioinformatics, Biomedical as your main subjects.

Good luck!

First of all, DON'T LISTEN TO YOUR RELATIVES!!
Now we've got that out of the way, the first question is, what do you want? You want to go to school for the next two years? Or you're inclined towards a more skill oriented course such as polytechnic?
In my personal opinion, you're better off studying high school and then go for engineering, as it gives you broader options. I'm not saying polytechnic is a bad choice, it's just that you should study high school.