16 years old - Do I have tubular breasts?

Then if ones breasts appear as the photos, the answer is yes. However I have seen women's breast shape change after development and would be cautious until after the age above.

Thank you for the question and picture.
Yes, I think your breasts do demonstrate many of the qualities seen with tuberous (constricted) breasts; there is a wide range when it comes to tuberous/constricted breast presentation.
Generally speaking, some of the characteristics seen with tuberous breasts include a very narrow base, short distance from areola to inframammary fold, tight (constricted) lower pole of the breasts, relatively wide space between the breasts, "puffy” areola and some degree of ptosis (drooping).
Generally, correction of tuberous breast anomalies involves breast augmentation with areola reduction / mastopexy procedure. The distance from the inframammary fold is increased (to create a more rounded out appearance). Proper implant positioning improves the distance (cleavage) between the breasts. The areola reduction helps to treat the pointed and "puffy" appearance of the areola.
In the most severe cases of tuberous breast, a more complete breast lift may also be necessary. In many cases however, a lift is not necessary. The patient should be aware that the final result will take months to see and that they will need to be patient and that revisionary surgery is more likely than in patients who do not present with tuberous (constricted) breasts.
In your case, if the appearance/shape/size of the breasts are a concern, you may be an excellent candidate for corrective surgery at some point.
When you are ready, please make sure you consult with well experienced board-certified plastic surgeons who have significant (demonstrable) experience with this type of surgery.
I hope this, and the attached link (dedicated to corrective surgery for patients with tuberous/constricted breasts) helps. Best wishes.