You can't. Nothing you do can really take away the hurt you caused. But time and your actions going forward really do help show people that you've changed and wouldn't do those things again.
This is also one of those things you shouldn't keep from Adora.
And you need to figure out how to deal with the fact that you did all that you did. Because like, you know it wasn't a good thing, but there's still the guilt that comes along with all the hurt you caused.