I am 18 years old and I believe I have tubular breasts. Will I always have this issue? Have they stopped growing?

I appreciate your concerns, but it is nothing to be ashamed of! I recommend that you get your parents involved and tell them how you feel and of your embarrassment. Without physical exam, hard to say exactly what needs to be done, but seek the opinion of a board certified plastic surgeon.

In 18 years of age of breast growth is probably complete. The architecture of the breast is genetically determined.