I lost 2 really good friends because of my selfish actions.
As this been affecting you mentally?
I can't stop thinking about it.
If you're stuck thinking about that frequently, it may help to speak to a therapist.  They can help you get healthy!
I'm not sure about that and I'm not sure I have a problem, it could have been my actions that caused all this hurt.
Trust me, seeking help from a therapist will be beneficial for you. They can help you get back on track to a healthy mental health state.