Teenager, You may not see what I see in you because your self esteem and trust has been hit. But what I read between the lines is sufficient for me to make that statement.
With regards to the past. You are right. It will always be there because you cannot take away what has been done. But you can elevate yourself to the point whereby hey! it doesn’t matter anymore because you have risen to the stage where the past no longer influences your decisions for today or tomorrow. It’s not easy. It takes time. But at your age you have so much time. There is a saying “Time is a great healer” That does not mean you forget but that time makes coping so much easier.
Don’t worry about others right now,just worry about yourself, you have plenty of years ahead of you to worry about others.
I am as my name says, Nobody from Nowheresville but if I can see your potential believe me so can others. Be well and be happy.