I live in a shared house. It's not my TV.

If you've signed a joint tenancy agreement with your housemates, you'll only need one TV Licence to cover all the TV receivers in your house. So it's a good idea to share the cost. If you don't have a licence between you, whoever is found watching TV when an Enforcement Officer comes to visit is the one who risks prosecution and a fine of up to £1,000. It could be you, whether you own the TV or not. If you've signed a separate tenancy agreement and you're taking a TV receiver to use in your room, you'll need a TV Licence of your own.