Vito,
just some information for you. If you are younger than the normal
enlistment age of 18, you may enlist early under the VEES Voluntary
Early Enlistment Scheme. I know cos I myself volunteered under that
scheme!
I went in when just
a 17 year old kid!
For more info on that scheme, tune to
http://www.miw.com.sg/publish/MIWPORTAL/public/mindef_services/register_for_ns/Apply_for_Early_Enlistment_.html
All the best to you! 