The abuse is not the fault of the victim. If you are touched in a personal way that feels scary to you, then it's abuse. If you are touched in a personal way that feels uncomfortable with you, then it's abuse. If you are touched in a personal way that feels bad to you, then it's abuse. Most abusers refuse to seek help because they don't realize how bad their problem is.
Victims often feel too embarrassed or scared to seek help.
They also may not realize how bad the problem is. Try to get help from organizations like teen health centers, your local battered woman's program, or crisis lines. There are laws to protect victims, shelters for battered women, support groups, and sympathetic people willing just to listen.