Odds are good that you're just going through the "what have I done" stage or the "what if nothing happens" stage or even the "why don't I have a deeper voice yet" stage. Realizing that you've finally done it--or just waiting for the changes--can be very anxiety-inducing.
Me, I was so terrified that I wouldn't get my shot and so relieved after I finally got it that my body sort of went into shock. Two minutes after the injection, I was standing at reception with my credit card in hand. I felt the indescribable sensation of twenty years' worth of fear and anxiety and desire and rank terror just lifting away from my body. I became light-headed and keeled right over. Good job one of the nurses was standing right there. She caught me in mid-air, I guess.
I was right as rain, and completely euphoric, right after that because I was on my way. But in the days ahead, I still worried that the T wouldn't do anything for me or that it would do bad things to me. I had all sorts of crazy thoughts. What if I never get facial hair? What if my red blood cells go nuts or my cholesterol hits the roof--and what if my endo makes me stop T because of something like that? What if I am still severely depressed? What if my face never changes? What if I sound like Mickey Mouse for life?
I had to learn to just enjoy the ride and take things as they came.