Personally, I haven't used the camera feature on Omegle, but I think if you think you're a better person, you should not feel bad for what you did as a teen. I constantly think back on things I did, and you were only a kid, whatever you did was when you were younger, not now.
From the sounds of it, you have changed and matured, as is expected, so try not to fret so much! Everyone makes mistakes, especially when they're younger!