I'm not a fan of insulin myself, if there are other options, but lots of diabetics find it to be wonderful for BG control. I was on it for a while myself, but I'm doing oral meds + low carb diet now. It works for me, but I imagine that I'll eventually be back on insulin, and that's fine.
Don't beat yourself up over past mistakes. You can only really move forward now, and I'm sure you will have that A1C back to normal in no time flat. :) Insulin can give your pancreas a break, too, which is nice. Just look out for those low sugars! They can really sneak up on you.