I received mmr vaccine in 2006... do i need to get another shot after 15 years (2021)?

Usually a single booster after the childhood MMR is adequate to protect. If there is a question, you can have blood titers checked for measles mumps and rubella to see if you are protected.

From your listed age (43) you may have received a single MMR in childhood as the booster was not given routinely until the 90's. A dose in 06 suggests it was a booster to catch up with prevailing standard. If the 06 dose was your first & only one another would be needed, if not, none unless your blood titers were poor. This is not one we boost on a regular basis.