In North Carolina, if a 17-year-old has their own insurance, premiums will increase because teenagers are considered high-risk drivers. This is due to the fact that they lack experience on the road and are more likely to be involved in accidents. As a result, insurance companies charge higher premiums to reflect this increased risk. Additionally, teenagers are more likely to engage in risky driving behaviors, such as speeding, texting while driving, and driving under the influence, which can further increase premiums.