I Am 19 Years Old and I Am Having Trouble w/ my Chubby Cheeks, I Want to Get Rid of The Baby Fat?

It is difficult answer your question in a customized fashion without any photographs. It is very true that "baby fat" will dissipate in the next few years (by the time you are 25) and if your appearance is caused by this "baby fat", getting buccal fat removal will only prematurely age you by the time you're in your early 30s. However, someone with a disproportionately fat face will still have a disproportionately fat face five, 10, 15 years in the future. An experienced plastic surgeon will be able to make that judgment call and advise you if you are an appropriate candidate for this operation. Is there is still any lingering doubt, it is best to wait till you are at least 25.

Very young adult patients ( e.g. 19 year old) with chubby cheeks are usually excellent candidates for buccal fat removal. Chubby cheeks are commonly caused by enlarged buccal fat pads: pockets of fat deep in the lower aspect of the cheeks. By removing then surgically (buccal fat removal) patient candidates could permanently correct their chubby face, thus achieving a thinner more chiseled facial look. n my practice I routinely perform the procedure wide awake under local anesthesia, without pain and without sedation. The procedure takes under 1 hour. Recovery is associated with some days of swelling. Result can start being seen in 3 weeks post surgery.
The video below helps to understand who could be a candidate for buccal fat removal. 
John Mesa, MDBuccal Fat Removal Specialist Plastic Surgeon New York City - New Jersey - Miami