This is technically feasible. People often start to create a website on a free platform. The free domain name that you then get is a subdomain of a provider and looks something like this: www.thisisme.wordpress.com
It can be a good idea to consider registering your own domain name www.thisisme.be after a while. You will obviously not have to start all over again, but transfer the contents of www.thisisme.wordpress.com to www.thisisme.be. DNS Belgium cannot do that for you. Your registrar can establish a connection between the two websites, on condition that your registrar and the provider of your free website agree to the operation.