Hello aspirant,
Becoming astronomer is not easy it requires hardwork, patience, and keen interest in the subject.
A typical path  to become an astronomer is you have to do a 4 years  bachelor's degree in Science (usually in Physics or Astronomy)and then a 2 year course for master's to get your Master's degree in Science and 3 years to complete your PhD program.
Hope your doubts are clear now.
Good luck.