Is this a condition of some sort?

Sometimes I jus hate everyone (except for this girl I like) n I jus wanna kill someone, n I jus sometimes get instantl enraged for no reason. and I have a very short fuse, n I get so angry I can FEEL the negative energt JUMPING thru me literally in very powerful surges. it gets hard to control, n the energy jus has a desire to burst out of me in the form of hitting someone so hard tht I break something on them. like its like another force struggling to overtake me, like complete pure rage. n I get mad easily, and it jus gets higher n higher n higher n harder to control. n I have thoughts of killin ppl I don't like. And another side of me comes out if someone at school pisses me off, idc if the techer is there, I will cuss them out so hardcore. jus so loud n destructive n I say the most hurtful things, n I made this dude cry once cuz I cussed him out. n I jus tense up n get ready to fight, n I want to jus fight. then one time it took ppl to hold me back, bcuz if they didn't I think I really wud have killed this guy. but sometimes I feel bad after I go off on someone, but other times I feel like I'm jus giving them what they deserve depending on who they r. n the anger feels so strong. like nothing I ever felt before n I am not being metaphorical, it feels like a huge entity jumping all over me. idt think its normal anger like u have, it feels like a demonic rage. n I am afraid it will jus all overflow one day, but I don't wanna end someone's life.

Sounds like "anger issues" to me. Swearing at people isn't appropriate behavior. I would suggest finding other ways to deal with the anger you feel so that you don't lash out and harm other people. A guidance counselor could have some useful suggestions. If there's a cause or a trigger that underlies your anger, a gc could help you talk through that, or connect you with a therapist who can.

It's better to deal with this now, than to let this continue to fester. You could dramatically change your life for the worse with one fit of rage... and you could have employment problems in the future. No one wants an employee who goes off on other employees creating a hostile work environment.

Good for you for recognizing that this is something that needs attention. You're already waaay ahead of most people with anger issues.

Here are a few resources:
http://kidshealth.org/teen/your_mind/emotions/deal_with_anger.html
http://www.helpguide.org/mental/anger_management_control_tips_techniques.htm
http://stress.about.com/od/stresshealth/a/dealing_anger.htm
http://www.apa.org/topics/anger/control.aspx

You can find many more my searching for "anger management" and "controlling anger."