BARABOO, Wis. — A Wisconsin teen told jurors at his homicide trial Wednesday that he didn't bring two loaded guns to his high school to shoot his principal.

Instead, 16-year-old Eric Hainstock said, he just wanted to scare his teachers and fellow students into understanding how seriously being bullied was affecting him.

"If they were scared, they would listen," Hainstock said. (VIDEO)

But prosecutors allege Hainstock intentionally shot John Klang in the hallway of Weston High School in Cazenovia on Sept. 26, 2006.

Hainstock is being tried as an adult and has pleaded not guilty to first-degree murder. His attorneys contend he is guilty only of reckless criminal conduct.

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On the morning of the shooting, Hainstock testified, he awoke feeling tired of being picked on at school and said to himself, "I have to get all of this to stop."

At school, he was stuffed into lockers, had his head dunked into toilets and was called a "fag" by his classmates, he said. As a result of the bullying, he attempted suicide three times.

His classmates' comments "cut a little deeper," he said, because at the age of 6, he was sexually molested by his 12-year-old stepbrother. He kept the alleged assaults a secret, he said.

Hainstock's father, Shawn Hainstock, cried as his son testified.

When he came home from school, Hainstock said, his parents forced him to do most of the housework. When he failed to do so, he was disciplined.

Hainstock testified that his father often kicked him and also used a wooden board called "the board of education" to spank him. (VIDEO)

He said his father also refused to provide him with medication to help curb his attention-deficit hyperactivity disorder.

After loading his father's 20-gauge shotgun and .22-caliber revolver, he drove to school, hoping he could force Klang to listen to his problems, he said.

When he entered the school, he screamed, "Everyone get in the office. I'm not f---ing kidding!"

He said he didn't get flustered when the school's maintenance man, David Thompson, was able to grab the shotgun out of his hand. Hainstock said he reacted by pulling the handgun out of his pants.

When Klang turned the corner, Hainstock testified, he pointed the gun at him and said, "I ain't going to do nothing ... let's go to the office, I want to talk."

Hainstock said Klang agreed to talk to him in his office, but as they walked there, Klang grabbed him and the gun went off accidentally.

"The gun was caught in the clothing of my arm and when he pulled my arm it went off," Hainstock testified.

He said he then aimed the gun at Klang's arm and fired "so he would let go of him."

After an accidental third shot fired, Hainstock said he was in shock.

"I didn't think Mr. Klang was going to die ... I hoped not," Hainstock said. "I didn't plan to hurt nobody."

On cross-examination, Sauk County District Attorney Patricia Barrett attacked Hainstock's suggestions that he was a helpless victim of teasing and bullying by his fellow students.

She read a long list of incidents in which school officials reported that Hainstock was the instigator.

According to school officials, Hainstock slammed a chair against the legs of a student during a choir class in 2003, calling teachers "gay" and "fags" after being kicked out of class, and snapped a thick rubber band against the back of a classmates head.

Under Barrett's questioning, Hainstock also admitted to using marijuana, LSD, psychedelic mushrooms and cocaine.

Closing arguments in Hainstock's trial are expected Thursday morning. The trial is being streamed live on Court TV Extra.