I was born on 25 June 1973 and my friend was born on 25 may 1978.

Rajesh,
You were born in the year of the Water Ox, and your friend was born in the year of the Earth Horse.
Your elements are not compatible, as your element is Water and your friend's element is Earth.
What happens if we pour water over soil? It gets muddy. You should also know that you two won't be friends for long, as the Ox doesn't get along with the Horse. You should both move on, and look for more compatible friends. Good luck to both of you.