After a year on shots in the thigh, you are probably developing scar tissue which would make it a little more difficult to inject in the same places over and over again. Switch legs every week and try to rotate where on the leg you're injecting. I keep a notebook that says the date of the shot, which leg I used, which position on the leg I used, and if anything weird happened. I basically have 5 spots on each leg I can use, so this week it's right leg spot 1, next week is left leg spot 1, week after that would be right leg spot 2, etc. It helps.
I've only ever had one instance where I couldn't get the needle in on the first go, and that was because I wasn't using enough force to get it in past the first few layers of skin. It was just a little pinprick of blood though. Not running down my leg style. Did you perchance try to inject with the needle you use to draw your T? I use two separate needles (one for drawing one for injecting) and I am positive there would be blood everywhere if I tried to inject with the one I use to draw because it's huge.
I'd say try again today on the opposite leg. Pick your spot, aim, and dart it in. Make sure you're using the right needle. You could also try icing your leg before to dull the pain of the needle initially breaking the skin.