I am 23 yo. Are my breasts tubular? (photo)

Far more important than the technique is the skill and experience of your plastic surgeon. Choose your surgeon rather than the technique and let them explain why one technique may be better than another.  See the below link on some suggestions on finding the most qualified Plastic Surgeon for a Breast Augmentation Always insist on a board certified plastic surgeon.

No, you don't have Tubular Breast Deformity.  If you are interested in being larger, you would be a good candidate for breast augmentation.   I recommend an in-office examination as well as a detailed discussion with a surgeon who you are comfortable with.   Finally, make sure your surgeon is a Double-Board Certified Plastic Surgeon certified by the American Board of Plastic Surgery (ABPS), a member of the American Society of Plastic Surgery (ASPS) and the American Society of Aesthetic Plastic Surgery (ASAPS).Best,Dr. DesaiBeverly Hills Institute for Aesthetic Plastic SurgeryHarvard Educated, Beverly Hills & Miami Beach TrainedDouble Board-Certified Beverly Hills Plastic Surgeon

Thank you for your pictures and questions. I see no evidence of any features of tuberous breast deformity. You have very nice and shapely breasts with a small amount of nipple protrusion. If you are interested in larger breasts, or changing the dimensions or appearance of the nipple, then there may be surgical options for you. Make sure you see a local board certified plastic surgeon to discuss those options. Best of luck! 

Your breasts do not appear to be tubular.  An augmentation would add needed volume and should give you a near perfect result.  

In agreement with other responders, your breasts both appear normal, without "tuberous" features.  There's a wide range of normal.  Breast morphology depends on many elements: Your rib cage, spine, skin type, glandular distribution, amount of gland and fat, nipple-areola complex, surface to volume ratio, intra-mammary connective tissue structure, etc.