Hello its great to see that you are so straight forward to what you want to become. So the most important thing matters is that believe in yourself and when you are so passionate about it then you are definitely gonna get it.

Astronomy & Astrophysics may be taught as a special course in the M.Sc. programmes of the physics departments in the universities or colleges. It is desirable for a student to acquire proficiency in physics and mathematics at the graduate level and then to Astronomy & Astrophysics specialization. An engineer with a B.Tech or B.E. degree, with an aptitude for Astronomy and Astrophysics, can also enter the field as a research scholar.

Though it is not necessary to undergo any formal training in Astronomy and Astrophysics at the undergraduate level, it helps the student to develop a general interest in the field, from reading good popular books or as an amateur astronomer. Research Scholars are expected to undergo one year course work in various subjects including Foundations of Classical & Quantum Physics, Mathematical Techniques, Numerical Analysis & Computing , besides introductory courses in Astronomy & Astrophysics. A good Ph.D. programme takes about four years to complete.

To know more go to the official site down below

https://www.iiap.res.in/?q=opportunities/career

All the best for the future.