domain name https://us-east-1.elasticbeanstalk.com/

Hello.

I think you can use it by registering the ElasitcBeanstalk domain with a CNAME record in the DNS zone hosting "www.egzersiz.com".
You can also use alias records if you host your domain with Route53.
https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/routing-to-beanstalk-environment.html#routing-to-beanstalk-environment-create-resource-record-set