“Your first protector is your parents. Then there are teachers, law enforcement officers and others. Eventually and most powerfully, there is you.”— Anonymous
Planning ahead is the best way to protect yourself. Start with thinking through how you can tell someone you don’t want to go to their party or hang out before a situation presents itself. For help and a dash of humor, check out how these three people handle telling a friend they don’t want to go to his party https://www.youtube.com/watch?v=bdwQntqI-ts
Then, when you are invited to do something, look at who will be involved and what is planned before you commit to an activity. If you decide to participate, despite that little voice telling you to use caution, have a plan to get you home safely.