Liposuction is an invasive procedure, and as so, it has possible side effects related to it, as do every surgical procedure. The fact that you are 19 doesn't gives any additional side effects, so in a healthy patient, I believe the procedure could be done if cleared by a pre-op cardiovascular and anesthetic evaluation.
Nonetheless, every case has to be evaluated in an individual basis, as every patient is different. If you have localized fat deposits that won't go away with exercise or diet, then liposuction is an option for you.
The best option for you is to visit a board certified plastic surgeon, so after through evaluation of your case, can offer the best alternative available for you.