I am 14 years old and have really bad sagging cheeks, sagging around the lip area and deep crease lines.

Hello mrbxoxI would advice you schedule a consultation wit a board certified plastic surgeon for physical examination.

Some of above deformities may be related to undeveloped cheek and chin/jaw bones. Most of facial bone growth is completed by the age of 14 in females and age 16 in males. Any intervention on the bonny structures of your face is considered safe after this age; it will not disturb further development of your face.You need to see a board certified plastic surgeon for good evaluation of your "deformity" first. Good luck. 

i suggest speaking to your parents and possibly seeing a cosmetic dermatologist for an evaluation. there are many options such as fillers, implants, or surgery but you should be evaluated to see what your problems really are and if there are treatment options for you.  best, Dr. Emer.