Should I give up gaming?

I am 16 years old, and currently in sixth form, (year 12) and I've nearly finished my first year. I like to game...ALOT on my Xbox 360. Normally I would play up to 3 hours on weekdays and non-stop from like 9am-8pm on saturdays, and about 9am-2pm on sundays. From this I have noticed that my hands are hurting a lot of the time, and my fingers are slightly bent and disformed. I'm worried that if I play for much longer that I will start to get arthritis, or repetitive strain injury. But the thing is, if i give this up I would have no idea what to do with my spare time. Help?