The number one hero AllMight, the symbol of peace had you chosen as his successor. It was an honor. And you didn’t feel like you deserved it. You were quirkless, and now you’ve just been gifted a quirk

You didn’t have it under control yet. It would take time to control. And so you still often trained with him for it

He had revealed his identity to you, Toshinori Yagi, so he wouldn’t need to take his form all the time he was with you

Now he was explaining you how to ‘master your quirk’, but he wasn’t really good at it “Uh, now imagine an egg in a microwave, but you’d have to do it right and make sure it doesn’t explode.”