He's just accustomed to being outside, it sounds like. If you keep feeding him and being sweet to him, he'll get used to being inside.

When kitties of any size first come into strange houses, they're real nervous and they just have to pace and meow and explore everything till they smell all the unfamiliar smells and scope out the territory. They stay sort of low to the ground and sniff everything and creep around. It sometimes takes them a few days to calm down. He'll be especially nervous if he's been accustomed to being outside 100% of the time.

Keep feeding him and just give him the freedom to explore so he can know where he is and know he's safe. He'll calm down. Take him to the vet as soon as you can to make sure he's disease-free and has the vaccinations he needs.
birdgirl73 Reviewed by birdgirl73 on . okay, help with stray cat please. i got a stray cat/kitten, well, old kitten. and it i have been feeding it for weeks, it lives in my backyard. put up signs, asked everybody, it is no ones cat, finally when i bring it inside, it starts whineing like crazy, it wants to go out side, it is sitting in my window sill, meowing like it is mad. what should i do? Rating: 5