I can't cum from anal (I use toys)

I been trying to cum from anal by rubbing my prostate but no matter what I do I ended up peeing from it instead, no matter how many times I do it ended up me peeing all the time. Any Good tips to help me with this? I wanna know how it feels like cumming from the prostate rubbing.

• I can barely feel my prostate but I find a spot that feels really nice and I poke it and it grew more and more intense and I thought I was gonna cum it ended up me peeing.