There are lots of ways to find and make new friends. Starting a new college course, joining a sports club, starting a new hobby....
Disabled Friends has a website where you can search for friends
For Disabled People has a website where you can meet other people with disabilities
Doing a sport or a new leisure activity is a great way to make friends. Visit Mencap Leisure Services
Or you can search for a local YMCA youth club
If you would like to chat on the internet to other people who have disabilities you could take a look at Disabled World