Culinary Arts

Both photography and cooking food is different. The best option you have is going to pursue short-term courses, this way you will be able to learn both without stressing too much.

It's never a good idea to drop out. As you still wanted to have some skills (Culinary) you have to study. Complete your 12th and then start in Culinary Schools. Maybe, Diploma but after that, it would be beneficial for you. Otherwise, you will regret why I dropped out.

Course duration: Regular Diploma course is 2-3 years long. Depending upon the institute, course duration may vary. Some institutes are known to offer distance education course format. Course duration may differ, when considering such course formats.
Eligibility criteria: 10+2 passed from a recognized board (or equivalent).
Admission process: Depending upon the institute, it could be direct admission process or merit based admission process.

Please refer to the link provided below for colleges which offer courses in M.Sc. Dietetics. You should be able to download their brochure which will give you a fair idea of any distance courses in M.Sc. (Dietetics).
https://www.shiksha.com/science/colleges/m-sc-food-nutrition-colleges-india

Please contact the college authorities as all colleges have different eligibility for certificate programs:
https://www.shiksha.com/hospitality-travel/culinary-arts/course/professional-certificate-in-culinary-management-ecole-hoteliere-lavasa-pune-248634

End of the day you are living for your dream. My parents wanted me to do engineering or doctor studies. My field of interest was Hospitality I choosed it and I'm happy about it. A strong dedication for one particular thing will help you choose the right field. Think which will be helpful for you in future. Don't choose something you don't love now and regret for it later.