don't keep urself limited to chords, learn new chords. don't go like songs with so and so chords only choose any song u like ask urself what is ur favourite song. search the chords ....... practice without vocals or simply humming when u get perfect at chord changes sing along......... nyway.. for starters try papa kehte hain tune mujhe pehchana nahee(raju chacha) adat woh lamhe try with barre chords also.practice until u finally get it.