It's not just you. It took me 9 months even to get the catch point to start the spin. 6 months after reaching that point I've only just got to the stage where I can regularly do 2 rotations and last week managed 3 rotations for the first time which I was able to repeat a couple of times a few days ago. It can be a very long process if you don't happen to be a natural spinner. All I can tell you about the technique is that you need to keep your weight directly over your skating foot,stand up straight and don't allow your shoulder to rotate backwards. There is clearly more to it than that but as I can't actually do it very well myself I'm not the best person to advise you.
Stick with it, it will come eventually although a few lessons might help.