I play it totally different: i put my index on the G-string, middle finger on the D and ring finger on the B-string. For me it is much easier that way, the index on the G-string is a lot closer to the fret than when putting it on the D, so less pressure is needed. Furthermore it is a lot easier switching to E-major and D-major chords, because the index finger can just stay on the G-string and only has to change frets.
Will i get any problems in later playing stages by using that technique?