The joys of having a two year old boy

For some reason I feel so much pressure to have Ethan potty trained. I don't know why, but I do. He is nowhere near potty trained. I just don't want to force him. He has used the potty before and knows when he needs to go, he just gets so mad when we know he is about to poop his pants and we ask or encourage him to sit on the potty. If we are at home, he will go to his room and shut the door. Never fails. If we try to go in there he gets very upset and screams, "NOOOOO!! SHUT THE DOOR!! (repeated many times-tears included) Even if he is done and needs to be changed, he doesn't want us near him. He kicks and cries through the majority of poopy diaper changes. At daycare, I'm pretty sure he's acts completely different. If he is not at home, he finds a place in a corner or under a table to go. When he is with us and we are out and about, I know he does his best to hold it until we get home. When he starts whining and saying: "I want to go to Ethan's house!" or "Go home!" We know he more than likely needs to go potty.
I really think if we were to try really hard to get him mostly potty trained, all of our efforts will go down the tubes when the new baby comes in June. I am not one of those people that want to drag potty training on for 6-12 months. I want to put him in underwear let him feel wet and uncomfortable and hope it is a fairly short process. I guess I will quit caring what others think of our almost 2 1/2 yr old still in diapers. On a lighter note, he makes any situation funny because pretty much everything he says makes us laugh. Not only the fact that he often speaks in 3rd person, but today for example:
Ethan and Daniel met me for lunch and I said, "Are you having a fun day with Daddy while Mommy's at work?" He says, "I'm having a fun day at work!" There is never a dull moment with him!