Transported in Harry Potter

A guy is transported into the world of Harry Potter, to his dismay, however, he finds out that magic doesn't seem to like him... he will need to make the most of what he has got if he hopes to survive till the end... but one thing is certain, he doesn't want to just survive. First story ever, I decided to give it a try, Forget op protag inventing new spells at the age of 2 potions at 3 and new runic constructs at the age of 6... This is meant to be as realistic as possible, I will, most definitely, make holes and mistakes but I will try to fix everything as we go on. Magic will be difficult for our protagonist thanks to a completely unfair and at the same time absolutely fair system of magic I set up, he will work hard for every improvement and in the end, it will be worth it.