rough driving conditions
 

Horible goin over bemps n potholes.. Rough ride.

thinkn of replacing struts with kyb

Do i need to replace frnt n rear? As well as the shocks?

I have the same issue, it has gotten a little better when I put 18" rims on it but still is a bit rough...

You should replace both front and back, and if you are looking for a softer ride get something near stock. Also, ultra low profile tires, lower than series 50, will make bumps harsher.
As for struts or shocks, the car uses either one or the other, but not both on the same axle. So if the front uses struts and the rear uses shocks, that is what you need to replace. You did not mention the year of the car so you will have to figure out what it is using