Someone might say it when they have completed telling a story about an event in their life, like a funny incident at school or a challenging experience at work.
People usually say 'that's the end of my story' when they have told all the relevant details of a story they wanted to share. For instance, if they were narrating a story about a party they went to, once they've described the people they met, the things they did, and how the party ended, they would say this phrase to indicate the end of their account. It can also be used when they don't want to continue the story further, either because they are bored of talking about it or they feel that the listener has got the gist of it.
Someone would say 'that's my story' when they want to end their account of an event or experience. For example, after telling a friend about how they got their first job, they might say it to emphasize that it was their unique experience.
Someone might say it when they want to cut off a conversation about a past event or relationship. For example, if they don't want to dwell on it anymore.
One might say it when they've completed sharing an anecdote or a personal experience.
A student who fails an exam might say this. They know that they can study harder, learn from their mistakes, and improve in the future.
Someone might say it when they are facing discrimination. For example, if they are being treated unfairly in a job interview because of their race, they could use this statement to assert their identity and make it clear that they won't tolerate any form of racial bias.
People usually say 'end of my story' when they have finished sharing an interesting or important event from their lives. For instance, at a gathering where friends are swapping stories, once someone has told their bit, they'll say this.
Often, it can also suggest that there is a conclusion to what they've been talking about. They may have told a story with a moral or a final outcome, and this statement is like a full stop to that narrative. For instance, if they were recounting a story about learning a valuable life lesson, 'that's the end of my story' is a way to emphasize that the lesson has been imparted through the story they just told.
Maybe they have had experiences that are so unique that they feel others won't get it. For example, if they grew up in a very special culture or family situation.
Relieved. It's like you've finally unloaded all the information or experiences you wanted to share.
Someone might say it when you've just come back from an adventure or an event that has elements that can be exaggerated in a fun way. For example, if you went on a camping trip near a lake and did some fishing, even if you didn't catch much, they could say this so you can make up a great story about it.