alright guys we're going to get this right, first off here are some good diagrams
First off djrizzo, you are missing your shots, this is bad because you are shooting up cocaine, which has some of the worst cuts, like levemesole a de-worming agent (think krokodil), you don't want to miss, if the injection site goes numb, that means you've just skin popped it, not mainlined it.
Try pulling back on the plunger the second you pierce the flesh, this will create a vacuum and that way when you hit the vein, you'll get a flash without having to pull back, you can just push in with relative security, it's always best to check a quarter into the shot to see if you're still in the vein, but with a drug like cocaine that causes quite a bit of vasoconstriction, this can also result in a miss, so just know it's a double edged sword.
Closeau, this is kind of the nature with heroin after a while, I'm on subs and off the needle for the past month and a half, but before then I'd been shooting heroin daily for at least three years straight, after a while you're receptors just get kind of fried out, you don't get that roller coaster rush anymore unless you get some really good dope, I've found doing massive amounts of mediocre or bad dope doesn't make a difference in terms of the rush, it has to be some fire shit. I can't tell if you're problem is that you're not getting the rush you want or if you're not getting the shot in the vein. Use those diagrams as a map.
Another trick that I believe I mentioned in this thread is to use a flashlight, you have to be in the dark or under covers to do this so its dark, and then hold the flash light up to your arms or legs or wherever the fuck you're finding the most success with, and it makes the skin almost translucent, you can see veins that you never knew existed. Don't try to hit the femoral vein, or any deep vein until you get good at hitting the superficial ones, and even then, don't use them unless you got nothing left and there's someone that really knows what they are doing that can show you how to do it. Hope this helped guys.