How should i break my bad driving habit?

whenever i drive i have a really bad habit of staring at the double yellow lines in the middle of the road. i am 17 years old and got my license in september, so it's been a good 6 or 7 months and i thought that this habit would go away once i got more comfortable with driving. well now i have become comfortable and i still stare at the yellow lines, while occasionally glancing up in front of me to see what i'm doing. i stare at the lines because i feel like if i don't look at them then i'm not going to stay in my lane and accidentally hit on coming traffic.
does anyone have any tips or ideas on how i could break this habit?
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