http://www.onlinegamingfun.com/online-gaming-addiction-symptoms/

Why am I hostile and negative?
I am 18 and everyday I wake up in a great mood, go to school and have a great time, i really like school this year. When I get home I become very bitter and Negative, my mom and I fight almost everyday and I know its mostly my fault.
I scream at her, curse at her/use curse words. and I am just overall bitter.
I sware I do not do it on purpose i feel bad later and try not to do it again, but I always do I cant explain it.
I read an article saying internet addiction’s symptoms in males are Hostility, but I am not hostile in general, only at home. and I am not on the computer nearly as much as I used to when i played an online game.
There’s really not enough information to answer that. You may have a mood disorder. It sounds a bit like bipolar. Perhaps it would help to talk to a school counselor about it. But ultimately, your attitude is dependent upon only one thing: you. Other factors can influence your mood and your reactions, but ultimately you can’t have a positive outlook unless you choose to have a positive outlook. And you only act towards others with hostility when you choose to act that way. You may feel compelling to, for example, scream or curse at your mother, but you can simply choose not to act that way. There’s nothing stopping you. You’re the one choosing to scream at her. Nobody has so little self control that they can’t stop themselves from acting that way. It’s just a matter of whether you are willing to exercise that self-control.
Next time you get the urge to scream at your mother, instead of just reacting, take a minute and ask yourself why you’re angry. Do you have a good reason? If you do, is it a good enough reason to warrant such hostility? Chances are it isn’t. Then think about what an appropriate, mature reaction would be.
Game on or Game over