Question

Why the name of my country say only India and why America is called as The America ??

Answer 1

When you are addressing a country on the basis of its full name that's when you use 'the'.

For example you should not say 'the China' instead you must just say China, on the other hand if you are addressing China by its full name you have to state it as 'the People's Republic of China'.

The same goes for the US and UK as the United States of America and United Kingdom are the full names of America and Britain respectively. Henceforth while addressing India by its full name we address it as the Republic of India
RULE OF THUMB :Only use the as a prefix 'the' for a country while stating it's full name​​​.

Some examples on when to use the for a country are
Ireland  - The Republic of Ireland
Russia  - The Russian Federation
Jordan  - The Kingdom of Jordan
Pakistan  - The Islamic Republic of Pakistan
Taiwan - The Republic of China
Kuwait - The State of Kuwait

Answer 2

umm ..
heya ..
I think u r wrong because u have heard right ki
the India is a developing country ..
the India has the tallest statue in the world...
we r the Indians etc etc
The word ‘the’ is used to show that ki it is a very special character and it is only one..
no other characters are like it..
so..
I think u know ..
the India is the best country in this world because here is a perence of unity in diversity..

hope u will understand