My tortoise likes corners

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Hi! I'm Rosie and I was given a tortoise for my birthday, he's called Terry and I've had him for a week now. I've noticed that he goes to the corners a lot in his house and also when he's out and about in the flat.
I'm not sure if this means he's scared or not. Does anyone else find this?
Thank you! View attachment 136341

Please don't let him walk around your home. It's dangerous and of no benefit to him. His enclosure should be at least six foot long and 3 foot wide with correct uva/B lighting at one end and a hide at the cooler end. His substrate needs to be firm enough for him to walk on without the substrate moving under his feet. Food no pellets or artificial food. Dandelion, nettles, kale, clover, prickly pear cactus. No fruit, cabbage,peppers, lettuce. He will be great.

 

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Thanks for all the advice - here is his house. i have been getting him out to run around because he keeps walking round and round his box in circles... is this the wrong thing to do? i thought he might like a bit of room to roam.
i also took him to the park a couple of times and he has been walking round there he seems happy enough doing that but the last time i took him we spent a few hours there and eventually he got tired and went to sleep under my shirt. This was on Sunday and since then he has been quite quiet - eating a lot more and sleeping more. this morning i found him asleep under his lamp exactly where he was when i went to bed even though i turned it off before i went to sleep. i'm worried i might have overdone it taking him to the park or that maybe he ate something he shouldnt!
any suggestions would be greatfully received.
Rosie

Enclosure looks too small. The food in the photo isn't good for him either.

 

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Also taking him to the park is not good either. Too larger space makes them nervous and you don't know what is on the grass. He has no where to escape when feeling scared.