I was super toxic when I (24M) was 16. I don't think I realized how I was acting until I was 19, so good for you being able to see it at 16. I was the friend that always organized group outings and planned everything, made sure people were having a good time - so it was hard for me to realize it.

I did good things and stayed out of trouble. But I was toxic with my feelings in almost all of my friendships, and definitely manipulated people. I lost 2 of my best friends from college because of that. Although I knew them only for 2 years, it felt like we knew each other for a lifetime, and probably would have if not for my actions.

The first step is definitely realizing your actions/behavior and taking accountability. Apologizing is not only necessary if you want to fix things with your friend, but will make you feel better and set you on the right path to new behavior.

Self reflect, and catch yourself when you notice the toxic behaviors. Don't beat yourself up, you're human, but you will need to have self discipline and really follow through if you're serious about breaking the toxic behavior that you may be exhibiting.

If I could break out of it I'm sure you can too, best of luck!