The shot I gave myself last night doesnt even itch (used the autoject) but the shot I gave myself sunday night (autoject again) still burns and hurts when I touch it. (showing it to my dad later, just in case it got infected somehow)

Seems like at least once every other week, I get an injection that really hurts when it's done, and it stays sore and itchy for the next 5 - 7 days. Bad needles? maybe?