Sorry to read that your sister wasn't very nice. It sounds like maybe you live in a remote location, the same as I did growing up. It was difficult because my sister was really angry and sometimes tried as hard as she could to be mean about my appearance. I guess sisters do that sometimes, since if they are unhappy, there are not a lot of options to improve the situation when you are a kid and don't have much control over who you spend time around, and so it is easy for them to just be mean to try to make themselves feel better. When I was a kid, I thought being mean was just kind of normal, so I better say that when I call her mean, I mean she is really terrible. Hopefully your sister isn't always lousy, but if she is, she shouldn't be, and things will change for you when you get older. Things are really better once you can go places on your own and choose to be around people who act decently. (You will find out there really are a lot of nice people out there!) If you are already an adult, maybe you already can go places on your own, but you will probably be able to afford to do that even more as you get older.
Well, I'm not from the UK, so I hope my words don't sound too strange. I was just curious about the UK thread and then I saw your post and was sorry it sounded like your sister was being mean.