Is it fair that your parents don't let spend more than 5 days in front of the computer?
Sorry but yes, if I had kids 5 hours would seem too much, at least for every single day.
You shold learn to swim! You can't do without that!
20 km? In Finland? The whole country is flat, isn't it? It would take you less than one hour (half an hour at decent speed) to cover that distance on bike, you'll do exercise, your mom will be happy and you'll be healthy and nimble. You can visit your friends once a week or as you like --always provided you're invited of course.
Go to the library and if you're done with the novels you were recommended check the sections about topics that seem interesting, history, sexology, whatever.
You may still play for a couple of hours per day on average. Abandonia does not advise against playing computer games.
Etc. etc. etc.