I'm a little concerned; i was given im cyanocobalamin and am supposed to inject 1ml per week. i already did that, but my question is thus; where does the fluid go if not into my veins? i'm new to this

Goes into veins: When you inject a medication into tissues like muscles, it enters the veins through diffusion. Some of the material may enter the lymphatics that drain into veins. So, indirectly it does enter your veins, even if the injection is not given into the vein.

I.M. Vit. B12: Do not be concerned. Many medications are given by the i.M. (intramuscular) route. The medication is slowly absorbed into the bloodstream from the muscle, similar as oral medications absorbed from the GI tract. The only difference is that the i.M. Route of administration bypasses the GI tract. Many medications are best absorbed by the i.M. Route. Follow your doctor's prescription.

From muscle to blood: When you inject i'm, the small blood vessels (capillaries) absorb mosr of it and send it off to circulate through your whole body, where it eventually gets distributed to your cells.