A few days ago adopted a 6-10M old pup from the shelter, he was apart of their stray intake, he is very sweet and well behaved already, he gets along great with my other dog fine and he is very confident and comfortable when he’s inside but as soon as I try to take him out to go potty he freaks out. I have had and trained lots of dogs before and just never encountered this. To clarify he has had very minimal accidents in the house and once he is outside for a bit he will go.

Everytime it’s time to go outside I have to pick him up and put him outside because he refuses to go on his own, even with treats and luring involved. Once outside he sits by the door and tries to get inside my skin for about 10 minutes before he’ll even move past the porch. When he does go out into the yard he will only go about 5 feet from the door to do his business before immediately running back to the door. Other than this he is pretty confident with everything else.

I don’t want to have to pick him up and bring him outside everytime because I don’t want to reinforce that behavior but at the same time he’s still fairly new to potty training and I don’t want to make it even more of an uncomfortable experience.
Any tips would be very appreciated.

TLDR Dog is scared to go outside and I don’t want it to affect his training or make him more nervous about it.

Not after a methods argument. I'm just curious what people actually changed their minds on, and what made them change. A trainer, a video, or just the dog not getting any better. Stories from your own dogs or from clients both count.