If so, does that mean if I were in the hospital and needed an IV to save my life,that I would die?
No. There are huge veins they can get to that we are unable to get to with insulin syringes.
My heart is breaking for you right now, I am so sorry you're in this position. You are playing a dangerous game and unfortunately, there is no way to really fix any of this except for giving your veins time to heal and focusing on your health.
As a fellow IV meth user, I have had my fair share of misses. When shooting in my legs, I used a flashlight pressed against my skin to help me find bigger veins.
As far as your misses go, I would tightly wrap my misses with an ace bandage and apply heat often. It's going to be sore and warm for a few days, but if it gets hot, nasty or looks like streaks are coming out of it, get to a doctor as soon as you can.
You really need to focus on babying the few veins you have left. Do not reuse needles if you can help it. Try not to fish around a lot and try not to hurry, but I know this is easier said than done.
There are veins in the backs of your knees that may be useful. Also, have a friend tie you off and try the arm above the elbow.
I hope things get better for you. Please try to take a break.