seriously just pee already

We are in the midst of another round of potty training. This is the first time that there haven't been accidents all over my floor or kicking and screaming matches. This is the first time that I am thinking it just might work. Except the kid doesn't pee. He has only had one accident in the last 4 days and that was at preschool where he flat out refused to use their potty. He once went 18 hours without going pee and then he ran full speed onto his little living room potty and pretty much filled that sucker up! he has some fear of different bathrooms - more like he is petrified. I tried to get him to go pee at Marshall's and I had even brought a potty seat he could sit on so it wouldn't be so scary, he freaked the fuck out. like all out kicking his legs and screaming like I was kidnapping him and taking away his lollipop all at the same time. It is so stressful. I feel like I am constantly telling him to try to pee - not that that ever does anything at all. He is 3. He should be potty trained already but every time we have tried it was horrible and all the other "systems" just didn't work for him. He wasn't ready I guess. The fact that he holds his pee for so long makes me think that maybe he isn't quite ready yet either - he still is scared to pee but as long as he isn't having accidents constantly we are going to stick it out. The entire process stresses me out. I am annoyed at hearing myself talk about peeing. We are out of the house a lot during the day and having to worry about him peeing makes it even more difficult. I think potty training might be overrated - diapers are so much more convenient. I hope he will get over his fears in a few days or weeks and we can put this potty training business behind us at least for a few months. I'm going to start working more with Mack more when he is 18 months. He pees probably 50% of the time I put him on the potty so maybe the potty training of kid #2 will be easier. Now I have go and try to get him to pee again because he hasn't peed since 7 last night. I was just googling ways to make a kid go pee ... I am desperate. Anyone have any advice to deal with potty fears?