Rubbing alcohol probably wasn't the best decision for sterilizing the needle. The best way to sterilize needles is by burning the tip of the needle for about three seconds. And if you were going to use rubbing alcohol for anything when it comes to injections you would rub it on and around the skin that you will be putting the needle into. You're not necessarily going to get infected though because you had some sense, and you didn't just stick it in (no loveual joke intended).