Im new here,And this place is awesome . Anyway,Kinda of a lame way to start,But always when I play the guitar.I find myself hitting the wrong strings! ...Any Exercise Suggestion? This mainly happens when I want to hit the D and G strings! .. .. ..
Appreggios, appreggios, appreggios

Practice both looking and not looking, slowly at first, building up speed as you go.
Ibanez GRG170DX
- D'Addario 9s
Squier Stratocaster
- D'Addario 11s
Kona Cutaway Acoustic
- D'Addario 12s
Kona K35 Amp
Rocktron Metal Planet Distortion Pedal
Dunlop Original Crybaby Wah
First play and look at which strings you're picking, keep doing it until you can do it comfortably and with ease, then try and do as much as possible without looking, practice the hard parts a bit more and eventually you'll get it. It comes with practice, so don't worry if it doesn't happen all that quickly.