I use insulin 4+ times a day sometimes i see blood where i inject what would happen if i accidently inject insulin in my blood stream, would my blood sugars drop to fast and to low, and i may blackout. i try not to but what if?

Not a worry: your breaking tiny skin vessels-won't get significant insulin into blood stream by doing so

Little chance: Even if you accidentally hit a small capillary with your subcutaneous insulin needle, the chance of it becoming an IV injection is quite slim. In many diabetic patients who get admitted for poor BS control, Insulin is given IV, although its dosing and schedule is different.