u/Mobile-Fly3506

Hello, I'm M19 and I need your help. I tried to inject myself earlier but couldn't get a vein properly even though they're visible.When I insert the needle, a slight pain starts and prevents me from pushing it in any further...

The last time I injected was at least two weeks ago, my veins have had time to rest since then

My question is, is the pain when inserting the needle normal, and when I find a vein, is it mandatory to insert the needle completely into the vein?

Thank you in advance for your answers!