You cannot be the destiny of anyone.
It is not even possible.
Even, alternative, a substitute is not found for destiny. Purely destiny is destiny.
Destiny is so strong and powerful that whether you believe it or not, does not make any difference. You cannot make any change in the process of going to happen.
You could be a mos powerful person in the town or city or state. You do not hold control over destiny.
Even, I have seen a war between deserves and destiny.
Destiny is most admirable.
None can understand the power or magic or way of working as it is invisible and away from existence.
In ancient times, you must have seen some cases of very powerful king try to control the destiny and found fail at last.
But away is left over. You can help or guide or coach or drive.
Absolutely under your direction, control, guidance, and coaching you can lead the person. By your guiding , you are able to shape the destiny of someone, provided follow.
You are too powerful in directions, coaching, guiding, mentoring, and leading. you have all the qualities which a GURU needs.
As per the famous ancient books of India, You cannot be Arjun but Krishna for all time.