Potty Training Woes

So I'm still potty training Josh. Bought another box of pull ups :( Don't know what to do with the boy. In public now, he loves to pee. 3 hour church went 4 times. Thought it was a fluke because he had a lot to drink before church. Today got a call from the teacher saying he peed 4 times while at school which is about 3 hours. At Costco, we peed when we got there and half way through he was like "my peepee is coming" really loud. So then I felt like a bad mother saying no you don't need to pee. You need to hold it till we get home. He still wouldn't drop it and was being loud so I lied and said that the toilets were broken and we would have to pee at home. We are now at home. Guess who doesn't NEED to pee. At home he never pees that much. I think he just does it because he is bored or something. At least he doesn't have accidents that way, but I never know when he really needs to go. Poop on the other hand is horrible. He will hold that in and keep getting little poops on his pants until he decides he can't hold it in anymore...usually all of this is done in the underwear...hence why we have pull ups. He doesn't care if it is a pull up or underwear. I do. He also likes to poop outside. Maybe I need to redecorate the bathroom with a tree and some grass. He can tell me where we need to poop but just doesn't DO it where he knows he should...the toilet