Can’t not ejaculate.

I’ve been using prostate massagers for about 6 months now usually once or twice a week and also been using dildos and other insertables for many years. When using a prostate massager I squeeze and hold my pc muscles and eventually get involuntary contractions and focus on my anus and prostate and the feelings coming from them. All of that is great and feels good but I eventually just get a penile ejaculatory orgasm that isn’t much different from a traditional one. Am I doing something wrong? Or is this a phase and if I keep going should I be able to over come this?