Dont propose her at all.... Frm your situation it looks like  she would definately say YES.. so wat after that ?? happy ending to your love story....No..after that you would find out that she has defects too ..there are stuff you wont llike abt her and she wont like your farting habitt either...ani you'd would also realize that she isnt that great as you thought and not as beautiful as in your mind..small things will matter... All her beauty frm 5th grade till now will be gone after your honeymoon...and i really pray all mighty heaven that you dont change  frm roshani_ko_jyan to roshni_ko_jyan_line_mache........  So dude  lets preserve her BEAUTY and your pure LOVE............Let it be alive till the end of time...after all, all good love story has sad endings...True love is alwayz tragic..learn frm da Classics,, like munna and madan,,romeo and juliet......