Lol don't spend your time looking back on the past with regret. Look forwards to a better future.
I spent a large part of my teenage years sitting in front of a computer screen, or playing video games. But so what? I left school with top A-Levels, am now at a top university, set to get at least a 2:1, have a beautiful girlfriend who I love with all my heart and who I intend to marry after we graduate.
Do I wish I'd spent less time staring at a screen? Yeah, maybe. But it wasn't all bad - playing on Xbox all the time with all my friends from school when I was about 15/16 - those were good times, as was playing Runescape when I was about 12/13/14.
Lifes too short to have regrets. You haven't done anything wrong, and even if you had, Jesus died for our sins so there's nothing to worry about.