Prarabdha "प्रारब्ध" is Fixed, No One can change it.

"Prarabdha" other name "Fate / Destiny" - A Bundle of good and bad experiences we get in the journey of life which is part of our past karma of many lives , which have been accumulated, which is result of both good and bad deeds . Human cannot free himself from Karmas .

Prarabdha of all the human beings is  fixed , most beautifully said

प्रारब्ध पहले रचा, पीछे रचा शरीर।
तुलसी ये जान के भी मन ना बंiधे धीर

Everything is Pre-decided by god, No one can change his Prarabdha. We put all our efforts to change our Prarabdha but its pre-decided , no amount of efforts can change our Prarabdha .

Someone is rich, Someone is so poor, Some lives long, Someone dies so early , Someone is getting married early, Someone getting it so late. Someone is longing for a single child and someone is bestowed with it without any wish.

What is this , is there any control?

No control on result but yes full control on present karmas. We cannot defend ourselves saying that it was in my Prarabdha , our past karma's made our present and our present karmas will make our future . InBhagwat Geeta Shree Krishna Said "कर्म करो और फल की चिंता मत करो" and along with that he said "अशोक रहना तेरा धरम है"means you have to put your efforts and whatever comes after that you have to accept it fully with happiness, no regret, no desire to change it but to accept it and while the desire of kings also remains unfulfilled . Let’s be happy and content our Prarabdha is good because God fulfills basic needs of every individual in our Prarabdha without any comparison.

The Door from comparison enters , happiness exists. We should notlet go it and be happy whatever we have got. Keep putting our efforts and then embrace whatever is being gifted by God.