How can you convince a girl that you love her?

Look her right in the eyes, smile, tell her she is absolutely beautiful, if you have kisses her before, kiss her, if not I don't recommend trying it. Tell her there is no place you would rather be. Then tell her. Worked for me. Of course I messed it up later. But we were together and happy for a long time. If not, than maybe it just wasn't meant to be. Remember, if you love someone let them go, if they come back to you, they are yours.