What length needle do you use for B-12 self-injections?

My surgeon gave me a prescription for vitamin B-12 so I could give myself my own injections, as he felt the injections were better and cheaper than sublingual B-12 pills. I had the script filled at the pharmacy and also purchased needles/syringes there. The pharmacist supplied a thin, 5/8" long needle. I gave myself an injection in my thigh yesterday, but I was very surprised at how painless it was. I inserted the entire needle straight into my leg, but felt nothing and I'm wondering if the needle was long enough to hit my muscle? Thanks.

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