They are NEEDED shots, and you are doing the right thing. It hurts everyone to get shots.
Your turtle will only hurt of a couple minutes, and then, be fine. Just think about how you get shots. They hurt for the 1 second it takes, and then it goes away.
You should be brave. Im sure you will do fine. Just remember what the vet said, and everything will be fine. Good luck.

Cap-hits, not Cafits.