doing something you don't want to do. For example, you could call your parents and say, "Hey, Uncle Billy called", and your parents would then know to come get you discretely.
Another thing you can do is use "refusal skills". If you are in a risky situation, you could use excuses for why you can't participate such as, "well, I'm taking a cab", "I'm on medication", "I am allergic to alcohol" (real thing, by the way), "I have a test tomorrow and I can't stay." Saying "you" in a "you make me" excuse can often make the other person defensive and it might be harder to leave situations you're not comfortable with. Instead, use the word "people" in replace of "you".
Remember that body language is vital. No means NO, but depending on the way someone says it, the word could send mixed messages. If you find yourself being pressured into premarital sex, breathe. Don't panic. All you have to do is say "no" and say it right. When girls seem insecure, most blush, giggle, look away, or twirl their hair. With something as serious as the descion to have sex, girls need to know for sure if it is a yes or no. Well, it's a maybe... As soon as a girl thinks the word "maybe" concerning sex, she should say "no" until she is absolutely, without any doubt, 100% ready to say yes and face results. If you're a girl and you're "no" sounds unsure (maybe) then most men will try to step in and help you reach the "yes" state with sweet talk, etc.
If you're unsure, it's a NO. Say "no" firmly. You mean it. You aren't ready, not yet. Don't feel bad if the boy gets mad or upset, instead be honest with him. Have a system set up with yourparents or guardian(s) in case he persists. If so, stand firm. You said "no", and "no" means no.
Realize that every choice you make will either impact you and your family positively or negatively. Sure it might be fun in the moment to try drugs, fool around or seduce, but... I know what happens when those momentary pleasures become lifelong addictions. My birth mother was addicted to cocaine. It was fun for a moment, then she couldn't live with out it and now, I, (her daughter) live with the consquences. I can only use my left arm.
What if she had faced that pressure to try drugs with a NO and surrounded herself with people that valued life and love? Some people say, "well because my parent was __, I __... It's in the genes/blood." Yes, all choices that you make influence future choices of others. But, as in the case with drug abuse, you can never make someone do something. Yes, if you're someone whose guardian or role model chose wrong paths, you, having been frequently exposed, will have a higher chance of following in their footsteps. But, at anytime, you can always take a step back and say, "At what level do I value myself?"
Keep in mind that there are people out there willing and wanting to help you keep to your positive morals, whether it's a counselor, teachers, or trusted friend. You are the only one that has a right to your body. You chose what you want to do with it, but remember the positive and negative outcomes of each decision you make.