What should I do? 10points!! ..?

my sister's using her laptop mum's on the computer n it's like this all the time.. I wanna play online poker but of course not with real money.. I'm 15 btw.. But mum doesn't really like me playing that game .. Well that was b4 when I had a bad obsession.. I stopped for a year or more.. Maybe2.. But I'm bored!!! Altough I have finals in about two weeks but... I can't seem to be able to study.. Everytime I wanna start I just lay a little on my be n b4 I know it I fall alseep.. I just cannot study anymore.. N I wanna play online poker.. And I started wanting to about 2 weeks ago.. Poker isn't the reason I don't n can't study.. This has been goin on a long time ago... 8-) what should I do?.. I really feel the need of playing poker.. N I know that I have responsibilities.. But I always finish the day without having any fun just sittin eatin sleepin sometimes tv.. And without studyin.. I started the year (grade10) studying a lot n no fun at all n now I can't do anything at all!!! Plz help!!!