Sun loses 1.534 x 10^13 kg m each hour. Then how it has been able to exist for several billions of year?

okay first things first you have the wrong value of E, the right value is 4.0 x 10^26 J so it's releasing m at about 4.4x10^9 kg per second. The m of the sun is 2x10^30 so it has enough m to keep itself sustained for a loooong time, about 10^13 years.