My parents were my best friends too. I could talk with them about anything (they both died in the last 3 years) but I also had a network of friends, I grew up with them, then people I have known along the way and people my parents were friends with I am trying to keep the connection. Then there is the woman I am going to marry with whom I have a relationship like my parents but with obvious differences.
It’s not bad that you dad is your friend but you need to know more people, you are young though.
That time my cousin and aunt made a scene the first night in the funeral home after my mom died. That’s irreparable because
Don’t get me wrong. They are forgiven, but it hurts and it will hurt for the rest of my life so I don’t be able to ever open the door for them to come back into my life.