new driver, advice for highway commute?

hi, i’m a new driver and i just haven’t had much practice as we only had one car for most of my high school. i recently started college at uh and i usually carpool with my sister but she doesn’t have classes on thursdays and i feel bad making her drive for no reason. i want to drive myself but i get pretty bad anxiety, especially in six lane traffic on 59 (my commute’s from sugar land). i’ve lived here my whole life n i know how important it is to drive here, but for some reason my brain doesn’t cooperate. do yall have any advice on overcoming my fear or getting practice, or anything really?