I think that my dad is abusing me and is letting his friends touch me.
In what way do you think your dad is abusing you?
I don't know for sure but he lets his friends touch me and I've heard that they abuse other children.
If you have been sexually assaulted by a family member, you need to get help as soon as possible. Sexual molestation is extremely traumatic and will cause immense psychological harm to you if it continues. You need to contact someone in a position of authority, such as the police, to get you out of that situation and into somewhere safe and free of abuse.
It's bad to talk about such topics. I may be just imagining things.
If you think that your dad is abusing you, you should definitely go to the cops about it. If people are touching you without consent you need to talk to someone. Talking things over with someone can help you figure out what is wrong and right.