How to relax to squirt? Any tips

So, every time my husband and I are having sex , I always feel like I have to pee. Well, in fear of peeing on him I start to squeeze on him. He of course keeps going because he insists that is me about to start squirting.

But, I truly desire to squirt! I read so many great stories about it. Also , for those whom squirt , is it all the time? As in each time i cum I'll squirt from now on?