Right vs Wrong

Hello, who gets to decide what is right and wrong? It is essentially our choice right? Unless we decide that a group or religion has a set of rules we would want to follow right? For example, I can choose to decide to not drink just because. But how do I decide that and then not hold others to that standard and not judge them? Basically how do I love them anyway? If I was a parent who decided not to allow alcohol in the house, then how would I establish that rule with my child given they were a teenager? Is that where a boundary would come in? Iā€™m just so curious about all it! Thanks!