From a scientific way: yes
Genetics give you body/facial traits such as brown hair or blue eyes. Genetics can also include inherited condition which might affect the way you act. The environment you grow up in also affects you (also called upbringing) as someone who was raised with domestic abuse in their family is more likely to think it’s a normal behaviour (this is just an example). I do agree people can change but genes and environment do play a big part in your life as you grow.