Are my breasts saggy? I'm 18 year old girl with bra size 34D. (photo)

Your breasts do sag, but they are not unattractive.  There is a huge range of variability in terms of breast size, shape, and form.  If you did want to give the breasts a more lifted look, that is certainly possible.  Find a board certified plastic surgeon who performs hundreds of breast lifts each year with favorable patient feedback.Kenneth Hughes, MD, Board Certified Plastic SurgeonLos Angeles, CA

Dear abcdsingh,
it is hard to tell for sure without an examination. Based on your photo, it looks like they are sagging. If you are considering surgery, I would suggest you consult a board-certified plastic surgeon. Only after a thorough examination, you will get more information and recommendations.
Daniel Barrett, MDCertified, American Board of Plastic SurgeryMember, American Society of Plastic SurgeryMember, American Society of Aesthetic Plastic Surgery

Your breasts appear to sag based on your photo.  Consult with a  board certified plastic surgeon regarding which breast lift procedure is best for you.  

Thank you for your question.There is some sagginess of your breasts. In my opinion neither your age nor the extent of sagginess warrants surgery at this time. A non surgical treatment like Thermi Tight may be helpful. Please contact an experienced Board Certified Plastic Surgeon who can help you. All The Best !

Hello dear!!
Thanks you for your question. It is my pleasure to help you with your concerns.
You can be your own best version, and you can definitely achieve amazing results with plastic surgery in order to improve your breasts. For you, I recommend an anchor incision breast lift with areola reduction, for perkier, youthful breasts. No implants are needed. 
I suggest you to make an appointment with a board certified plastic surgeon for a good evaluation and to talk about your goals.
I hope this is helpful.  Good luck :)
 

Based on your photos, you do have fuller breasts that do have some hang to them. And at 18 years old, I would think long and hard before putting scars in front of your breasts in order to lift them. Some women, especially with larger breasts that limit their activities, are more than happy to have breast reductions or liposuction at your age. However, breast lifts are often a "trade of"....you are trading perkier breasts for scars.  When ready, make sure you consult a board certified plastic surgeon and view their photos.

Just based on your photo, yes, you do appear to have some sagging. Do wear good support bras, especially when exercising. If you are interested, make an appointment with a board certified plastic surgeon and discuss your options.