I'm 20 years old my breast size is normal but nipples are very low.

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 BBL Always insist on a board certified plastic surgeon.

Without photos, I can only guess that you're saggy and you may need a breast implant and a breast lift for the best results. Consider seeing a qualified plastic surgeon in your area. Best wishes always, Dr. ALDO

Thank you for your question. It's difficult to give recommendations without photos or more information. Generally speaking, if you are happy with the volume of your breasts but wish for a perkier appearance, a breast lift might be right for you. This procedure reshapes your breasts and can bring the nipple placement "higher". You might consider fat transfer or an implant if you wish for more volume. Make sure that you work with a board certified plastic surgeon for precise recommendations. Breast of luck! 

Without seeing photos, it would be difficult to
assess your situation. I would recommend consulting a highly qualified, board
certified plastic surgeon to better asses your situation in person. You should
also do your research by looking at the surgeon’s before and after photos to
ensure they are in line with your expectations and desires. 

Thank you for your question.  Without a photograph it is difficult for me to make a recommendation to address your concern.  I recommend an in-person consultation with a board certified plastic surgeon to discuss your particular issue.  Best of luck.

Please put your front, side pictures. These pictures are easier to see if they are taking by someone else not close to the camera of the area you are interested only to give you a better answer.Choose a board certified plastic surgeon who has done a ton of Breast Augmentation and has privileges to do this surgery at a local university hospital. This says his credentials have been checked out by fellow Drs. All surgeries carry risk, talk to your plastic surgeon and choose one wisely.Many surgeons, including myself, offer online virtual consultations where you send us your photos and we can estimate the cost. I, like many surgeons, also offer free consultations so that you can be examined and given the most accurate quote possible. Please be mindful that the in person physical exam is the most important and could potentially alter your treatment plan.

Thank you for your question.

It is difficult to give an informed answer to your question without an exam or at least pictures of your condition.

If we make the assumption that you have classic ptosis, or drooping and low nipple position due to the shape and size of your breasts, then a breast lift can potentially be a way to raise the nipple height.

What you mean by "normal" breast size is also a consideration. 

If you do not have excess skin between your nipple and your breast fold, which may just be the way you developed, then you may not be as good a candidate for a conventional lift.

A qualified plastic surgeon will take your goals and anatomy into consideration and be able to recommend an appropriate plan after examining you.

Good luck!

Adding photos to your question would greatly improve the precision of my reply. However, an evaluation by a reputable experience plastic surgeon is likely the most expedient method to address your concerns.Best of luck!

Thank you for your question. Remember, it is best to be seen in person by a double-board-certified plastic surgeon for precise diagnosis and treatment.

I would suggest meeting with a board certified plastic surgeon. During the consultation, you will be measured and the options can be discussed to see what you prefer. There is no need to worry.