The Declaration by Gemma Malley

Anna has spent her entire life trying to repay the world for her parents' sins. She never should have been born. It's all her parents' fault that she is forced to live as a Surplus. They signed the declaration and choose to live forever but then they just had to break the law and have children. Now Anna is trying to make herself useful so she can have the best life possible for someone like her but maybe the new Surplus, Peter, might change her mind about who she is and her purpose.
The plot was more original than I expected. There are many books about the concepts of immortality* but the fact that it's set in 2140, makes it more exciting and interesting. This is almost impossible to put down. Anna journey is full of surprises and suspense. The descriptions were vivid and were very important. The whole world of The Declaration almost seemed real due to the enormous amount of thought put into creating it. I absolutely loved this book!
Anna was an excellent choice for a main character because it was so easy to put yourself in her shoes. Peter is also a very likeable character mainly due to his bravery and determination. There are also many other characters who are worth noting but Anna and Peter are obvious favorites so it's hard to pay attention to the others.