My dog hates being inside

I got a new dog about 5 days ago (he is a 6 month old) catahoula leopard dog)

and he won’t explore the house at all which is understandable since it’s a new environment, he just stays in his kennel all day (won’t even come out to eat) or sometimes he’ll leave the kennel but only to come to my bed and lay with me (kennel is in the same room as me)

the biggest issue though is he refuses to come inside when outside, outside he is a completely different dog, he is so happy and playful and runs around a lot. Which is amazing! But he refuses to come back inside unless I pick his 50lb ass up and force him to. Which is not fun for me since I’m a very small female.

I can’t leave him outside because we have predators and I have no fence outside so he would just run off. Is there anything I can do? I’ve tried luring with treats and that never works he just runs from me and I have to chase after him and grab him by his harness to pick him up and carry him inside.

Is this something thatll get better with time? I do not want to rehome this puppy but im also at a point where im sick of bringing him outside for walks because i know he’s gonna give me hell to bring him inside