(I will bold the important parts of the story)
You've been selected for the Weapon X program, they took you either by choice or full on kidnapped you. Placing you in a van as they drive you to the facility, once in there they start to beat you to near death. You think why they are hurting you but in order for the MGH serum to work you need to have high stress levels. Once you are beaten you are entirely strapped in a tube and stabbed at every part of the body! The entire tube filling with the MGH. Going into your body and giving you mutant abilities. (Only 3, one major ability and two low class abilities like super healing)
As they study you, (click this link to find out your three powers) you need to figure a way out of here but you'll be untrained if you stay you will be trained but be their killing machine