Susie replies:I'm scared to have sex. I don't really know if I know how to have sex. I am really nervous because I want to have sex, please help me?
As you are right now, it's better that you don't have sex. You're really not ready.
You're scared, nervous, anxious, and well, sex is supposed to make you feel good. All your negative feelings and fears right now are not going to make for a good sexual experience. Do you even have a partner right now? Do you have someone who cares about you, respects you and won't push you into something you're not 1000% (yes, a THOUSAND PERCENT) sure about? You also sound like you're in a big hurry, like the world is going to end if you don't have sex right now! This is not the right attitude to have. When people rush through things, they make mistakes. Sex mistakes can have dire consequences. You really need to chill out first so you can be of sound mind and body when you make the decisions you need to make regarding sexual activity.
Before you jump the gun and do something you might regret, I think you really need to contemplate the matter more deeply. We have an article to help guide you through the things everybody needs in order to be ready to enjoy sex safely and responsibly. Check it out: Ready or Not? The Scarleteen Sex Readiness Checklist.
You also should read these articles: