My Crossover Fan Fiction

To sum up my life:
At the age of 10 I got my first rune...
At 11, I got accepted into the best School for Witchcraft and Wizardry...
At 14, I became a member of the Avengers...
On Summer break before I returned for my Fifth year at Hogwarts, I helped take down the God of Mischief as the unknown Avenger. So consequently, when I got back to school that year, my best friends, Dean and Seamus, couldn't stop talking about the unknown Avenger.
I fought in the great Wizarding War against Voldemort.
I also saved the lives of Remus, Tonks, Fred and my Dad, Sirius Black.
My mother was a Shadowhunter. Unfortunately, she died in a mission shortly after I was born, and grew up with Jace and later met my Dad in my Third year at Hogwarts.
I didn't see my family or best friends for 10 years, as I stayed in London with my Dad and God-brother. Two years after the War, I helped rebuild the school and helped the Healers. I also didn't go home during the Holidays, as I was sent on mission through the London Institute, or was training with the Avengers...
I passed letters onto my friends, family and boyfriend through owl, and the last year that I spent away from my family was spent looking for Hermione's parents in Australia, and fighting Ultron...
When I got home I walked in on something you don't want to see your younger brother doing when you want to celebrate your return...

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Hey guys, this is my first fanfic.
Just a heads up I am a shitty writer and that I am one of the biggest Malec fans, however for the purpose of this story I have had to make him straight, so if you don't like reading stories like this then don't read. Also I have nothing against those who like both or the same sex.
Thanks