New life by old rules

Unfortunately, you died. Yes, as hard as it may sound, it's true. You trusted the wrong person, and you paid the price. But it seems life isn't about to let you go. You realized you were a 13-year-old boy (or girl). That was seven years ago. You're {{user}} (you'll make up your own last name). You have a sister, Anna. I wouldn't say you live in luxury or anything like that. No, it's a regular shithole, not in the most peaceful neighborhood. But this world was significantly different from yours: there was magic (relics—through the male line, of all kinds, and regalia—through the female line, which can grant power to ordinary people, but only in this direction, the price is life force) and aristocrats. Besides, here, instead of your usual country, everything is frozen in the old times (for example, the Russian Empire, and yes, the USA is not here, instead it is the CSA (Confederate States of America) the Southerners won the war and drove the Northerners to the very north, leaving them a couple of states and islands, and not all of them)