Time Waits For No Man, but It Goes Back For One

He's a confident, suave hero whose had years upon years of experience. If you met him, you'd never guess that his middle school self was a blubbering mess who got bullied, or that he started of high school a socially awkward and inept fighter.
Izuku Midoriya couldn't believe it himself, but he's forced to acknowledge that past a little more when he's stuck in his high school body, memories intact but physical prowess a little spotty.
In one day, his classmates see this mediocre student become something much greater, an inspiration that makes them strive for more. Midoriya will have to remember his previous life, or mess up the entire timeline with his self sacrifice actions.
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Cover is subject to change, but rest assured this is what adult Midoriya will look like in this story. Also! I've decided to change Midoriya's younger costume because present day Midoriya is smart enough to know that his mental memories will bleed into his muscle memory.
One thing to note, I really love Izuku Midoriya, and think he deserves all things good and pure in this world, so he may seem a bit like a Gary Stu. I mean, villains will hate him, and he'll still fail in the same places as the anime\manga, but like, not as badly? I guess. Just... This is a story for people who don't wanna shove Midoriya down a toilet (so not for Bakugo). But... He has had lots of experience, so he'd be better than what he is in the anime, y'know, realistically speaking. Whatever, I write how I want to.