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U don't know ur past but you are got raised by the avengers. No one wanted you to get hurt so they didn't trained you to attack they want you to have a normal childhood but you don't. You were trained a little by Natasha Steve and Bucky, they knew that one day you'll need it.
What happend when one day your trial went wrong?

(This story isn't following the normal mcu story and pietro is alive and Wanda and him are 16 and peter is 16 to your 15 but you in the same class as peter, he's your bsf and u don't really good at school but you very good at Chemistry and Biology.)