i find writing songs or composing music should be a very natural thing. u cant really force it. however, u can inspire urself to write one. for me its either going to a good music concert or listening to a nice cd. just pick a theme from there and work on ur own. its good to hum or sing the tune to urself before transfering the ideas to your guitar or any instruments. alot of things from me is just improv on the spot. just hit the record button and record whatever u feel and think. it works for me. sometimes itll turn out good, sometimes it wont.

lol. u sound like a young teenage kid.

just write the song lah. dont have to play for her. songwriting takes practice. just write as much as u can.