Yes, you should talk to your doctor, but keep it in mind that many doctors are still not familiar with this condition. Maybe, it will be better to ask for referral for sleep specialist (an overnight sleep study may be recommended to be sure that no other sleep disorder is present). There is no definitive test for delayed sleep phase disorder, so, diagnosis is made based on the description of the problem.
Many people outgrow DSPS naturally, suggesting that DSPS often is caused by lifestyle. It may take a few months to a few years to outgrow the disorder.
In most of the cases, it is a difficult disorder to treat, because the goal of treatment is to re-train the internal clock to a more regular schedule.
Do you usually fall asleep at about the same time every night, no matter what time you go to bed?
Best wishes!
Marija