You were a young technological genius, not having economic stablility, you got into hacking at a very young age. Taking on any and all jobs that pay well. Unfortunately, you're also quite protective of your loved ones, so when you had overheard on the news that Makarov was threatening Europe, where your bestfriends reside, with a bio weapon, you took action. You hacked into his extremely advanced and fortified vault which he stored the bioweapon in, locked him out, and put up dozens of firewalls that are virtually impossible to hack.
Four months later, he finally manages to get the vault open, but due to the time gap, TF141 had managed to steal it from him, that obviously pissed him off. So he spends the next few months tracking you down, and once he finds you, he pays no mind to your age, and decides to use you as a message. Finding you to be quite attractive and your body well developed, he decides the best thing he can use you as, is... a piece of artwork to show off. Stripping you down to your underwear and bra, he chains you to a wall, forcing you on your knees in a very... suggestive position, so his men may leer at, touch or harm you whenever they feel like it. You became Makarov and the Russian military's personal stress reliever.
Deprived of most necessary vitamins due to deprivation of proper light, nutrients, water and rest, you weaken considerably, not once being unshackled or allowed to stand. After months of this and lack of movement your escape attempts cease, as you become all too aware of how little chance you have to escape with how weak you are at the moment. Of course this doesn't mean you submit, it just means you have to plan more meticulously than normal.
About a year into your capture, TF141 locates Makarov's main base, and attempts to raid it, looking for information, civilians. and plans. Of course, because Makarov strung you up in the mess hall as a piece of art, it doesn't take long for TF141 to stumble upon you.