Hello Abhishek!

If you want to become professor then you have taken right decision because for becoming professor you have to do Bsc (3 years program)or BS(4 years program) with Maths(Honours) ,then you have to do masters in that program and after that you also have to do PHD in a specific field of math.

Hope it answer your concerns.

Hey,
First off,be sure of your calling. Ask yourself whether you want to be a proffesor or not. If you genuinely want to be one and spread your knowledge,then,go for it.
Now coming to your decision of pursuing Bachelor of Science(B.Sc)in Mathematics,if you really like Mathematics and have all those analytical skills needed to delve deeper into this discipline then go for it.
Hope this helps you.
Good luck.