grinding sound

What do the rotors look like??

the rotors looked normal.....no scoring not glazed

I would change the pads anyway. Turn the rotors too.

i got new pads for front....i will change the this weekend....and see what happens

Easy here.... Either you have a completely worn INNER pad you didn't see when checking the outers, or a pad holder has slipped in position, grinding away against the rotor. Subaru rotors are too thin to cut, so either replace or just inspect INSIDE (car side) surfaces for corrosion. Are these your original rotors? If so, it's done well, as the mean life here in the Northeast is 3 winters. Oh, I forgot: you may simply have a small rock stuck between the thin rotor backing plate and the rotor. Happens all the time with the salty gravel used in winter. Bend the plate(s) to shake out the rock and reposition to not hit anything when rolling. Start here before removing rotors and/or pads. Ern TSG/B

i took calipers off to see inner pads didnt see any scarring on either side of rotors.....but im going to do a thurough inspection.....this grinding is annoying the hell outta me lol

we just bought this car about two months ago from a used car lot

Again, are the rotors grinding against their backing discs when turning? Simple problem to solve, and commonly occurs after brake work.

no it is intermitent when braking

Yeah: the rocks bounce around, and the backing plate twists as you corner. Check anyway.