Depressing 21st Birthday

I need to say first and foremost that this post is NOT written to any of my family. I actually was writing songs on the guitar and started a different train of thought, which turned into a letter to all of my peers.
     When you turned 16, I told you to go out and live like a 16-year-old should live. I told you to stop worrying about me (still being 15) and feel free to date and drive and do all the fun things a sophomore in high school should do.
     When you won state or defeated a ruthless opponent, I cheered. I lifted you up and helped you feel like you were on top of the world.
     When you turned 18, I snuck balloons throughout your yard, with your positive traits inside each. I encouraged you to live life as a new adult.
    When you entered your senior year of high school, I told you I'd always be there, even though I would be living on a University campus. I told you I'd show you the ropes when you came walking through college. I was there for all of your big moments.
     I convinced you that this life was worth it, no matter how bad it got. I stopped you from doing things you would have regretted. I prevented you from taking your own life.
    When your parents got divorced, I stood by you through every step of the way. I hung out with you all day, every single day.
     When you had to get surgery done, or wear a brace, I was there to listen.
     When you had your heart broken by some boy or girl, I took you out to lunch, I reminded you how special you are.
     When I noticed you were alone, I introduced you to loads of my friends and you became an instant hit. I was there for all of your heartaches.
     In my biggest tragedy, pain, heartache, you LEFT me. For my 21st birthday, I won't have anyone pulling me on, I won't have anyone telling me all of the things I can or should do now. Because of my big heart, I get no love in return. Because of the way I loved you, I have to do this all alone. So Happy 21st Shannon. Go party... oh wait, nevermind, go hang out with.... nevermind, go... continue on, in more surgeries or whatever.