Take some initiative and go out and explore the world. You can pick up a new hobby, such as hiking, tennis, painting, playing an instrument, or anything else that you find interesting. If you feel like you want to go out sometime then then visit one of London's grand museums, or a museum anywhere else depending on where you live. Attend the theatre, go swimming to keep fit, or go to your local library to browse their books, and while you're at it, have an occasional meal at a small cafe or your local pub.
The world is literally your oyster. You live in the UK - when it comes to opportunities here, they're a dime a dozen. If you have lots of free time, which you probably do since you spend your whole day on the internet, then why not explore parts of England? Just take a train ride out to somewhere new, and you'll have a whole new town or city to explore. If you're feeling particularly adventurous, then you could do something like volunteer for the Police as a Special Constable, or something along those lines. Or join the reserves if you're not doing anything, you'll travel to new places, you'll learn new skills, and you'll get paid for it. They're always recruiting.
You can do a lot for free, and even more on a budget. Try going out instead of going on the internet, it's a lot more satisfying.