Hey, Mac! (Yeah, great name

)
Welcome to Susan's! I remember getting my first Rx for T. I drove home grinning, and feeling like I could levitate my whole truck -- it was an amazing feeling. You're lucky to be starting while you're pretty young -- not too long from now, you'll probably have a hard time recognizing yourself.
Have fun exploring the site -- there are some great resources here, first and foremost the other members.