I'm 18, would a breast reduction or lift make my breasts more perky? (photos)

A breast lift would reshape the tissue and reduce the size of the areola.  It does not require removal of breast tissue but only skin tightening which will make the breasts more perky.  Women who have the breast lift surgery report increased self-confidence and self-esteem.
Find a plastic surgeon with ELITE credentials (certified by the American Board of Plastic Surgery, education, experience, training) who performs hundreds of breast lift procedures each year.  Then look at the plastic surgeon's website before and after photo galleries and read patient reviews.  

 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), a member of the American Society of Aesthetic Plastic Surgery (ASAPS), and a fellow of the American College of Surgeons (FACS).Best,Dr. DesaiBeverly Hills Institute for Aesthetic Plastic SurgeryHarvard Educated, Beverly Hills & Miami Beach TrainedDouble Board-Certified, Double Fellowship-Trained Beverly Hills Plastic Surgeon

The
technique you are looking for is The Bellesoma Method.  This will reshape your breast tissue creating
upper pole fullness without implants, elevate them higher on the chest wall and
more medial to increase your cleavage. 
The weight of the breast is transferred to the underlying pectoralis
major muscle resulting in pain relief and long term stability.  Vertical scars are avoided, nipple sensation
and the ability to breast feed are maintained. 
Best Wishes,Gary Horndeski, M.D.