Trouble finding my prostate

I have recently learned about prostate massaging. I have tried a couple of times and cannot seem to find it. I have tried using mu finger once but could not get the right depth because of being obese and not flexible enough. I then decided to buy a toy off Amazon because I did not want to spend much money in case I did not like it. It is one of those vibrating cock ring/prostate massager toys. I am not sure if it is not what I need or if I am going to far it but it does not seem to be working. I have tried a couple of times with the toy but do not get the feeling everyone mentions. I have brought it closer, angled it as much as I could but nothing. Looking for some advice on what yall think I should do to find it.