Why does my injection hurt so bad?

As of right now im taking a stack of winny, primo, clen, and prop.
Im takin one ampule per week on the primo and 50mg eod of the winny and the prop im also taking eod at 150mg. My question is this. My first shot was 1 amp of primo with 50mg of winny in a 23 gauge needle. I took the shot in my upper right arm and you know how you can see the primo in the first cc and the winny in the 2nd cc.(clear/white) in the needle. well when the primo is being injected i cant feel anything but when that winny starts going in it hurts like hell. It hurts so bad, the first time i still injected all of it and i could barely move my arm for days but when i took the winny alone 2 days later in the cheek i couldnt feel a thing. So this week i thought i would try the 2 together in the other cheek but the same thing happen that happened with my arm it hurt so bad this time i had to actually pull out early and finish it off in my left arm. Why does it hurt so bad, or is it suppose to be that bad?

winny is said to be the most painful shit out there bro, according to some...but it appears that you are having no prob with it....mixing oils and water bases ive heard will put a hurt on ya too

Have you used test prop alone? It could be the propionate ester of the test prop. Allot of people are alergic to the propionate ester, making for a very painfull injection site.

It sounds like the oil/water mix may be the cause. What type of prop and what type of winny? If you were doing it in bis or tris it may be too much for them (2ml) if you're not big and it can't get absorbed well...no offense.

i weigh 200 with about 12% BF. and yes i have took the prop before and it never hurt before so you think its because im mixing them. and its winny and primo im mixing not the prop im taking the prop alone in a different needle. the winny is estanozolol nad the prop is american made. I have also took winny before the exact same stuff and it didnt hurt last time. so should i put the winny and primo in seperate needles

yes. the water based and the oil based will make a very sore injection site bro. Do them seperatly or mix the primo with the prop that will help cut some pain of the prop.
also like they said the kind can make a difference as well.