Water isn't going in

Hi, I really need help with this. I've tried a water enema for the first time today several times and im still having the same problem. I am using an enema kit that I bought from the drug store. I think that i'm doing everything according to what I've read. I let some water out, hang the bag high on my shower head, and then lay on my back and stick the anal nozzle all the way in yet nothing happens. I've been putting the nozzle all the way in until it reaches the rubber tube, is this the correct way, it seems that water leaks everwhere if I don't do this. The water isn't go inside me. The only way that I have been able to get water in is by taking the bag and squeezing with all my might, it is very tiresome and difficult and did not work well. I know there is nothing wrong with the enema kit because as soon as I take it out of me it shoots water everywhere. Please help, thanks.