"I feel ashamed - I'm sorry for the victims and just for my family," Kye Donald Wighton said in Wollongong District Court.

Wighton has pleaded guilty to two charges of committing armed robbery.

According to facts tendered to the court, Wighton phoned Eagle Boys Pizza about 8.20pm on March 17 and made an order.

He gave a fake name and asked for the delivery to be made to a house in Shoalhaven St, Nowra.

The occupant of the house told the delivery woman she had not made an order.

As the delivery woman returned to her car, Wighton emerged from some bushes wearing a hooded shirt, with a yellow bandanna covering his face and holding a knife.

She handed over $230 and Wighton ran down Ann St.

On May 22, Wighton laid an order with Pizza Bella.

Again he gave a fake name and asked for the order to be delivered to an address in Elizabeth Dr, Vincentia.

The house was unoccupied when the delivery man arrived about 7.30pm.

When no-one answered, Wighton approached him, armed with a tomahawk.

The delivery man handed over $213 from his money belt to Wighton.

During the subsequent investigation, police discovered the mobile phone number from which the pizza orders were made and began intercepting Wighton's phone calls.

During some calls, Wighton was heard admitting that he was involved in the armed robberies.

Yesterday, the court heard Wighton was adopted when he was a young child and his foster mother had died before he was 10.

He had also discovered the body of his cousin and he later suffered from depression.

Wighton began drinking, which continued when he moved to Vincentia.

He was initially refused bail when he was arrested on June 12 but was subsequently granted NSW Supreme Court bail on July 28.

However, Wighton afterwards surrendered himself to police when his grandmother, with whom he had been residing, had a heart attack.

"I didn't want to put stress on her so I thought I would come back to jail," he said.

Wighton is due back in court on Tuesday.