Having sex is something you shouldn't ever feel pressurised to do - there is nothing wrong with waiting until you're ready. When you are ready it's important to be safe and use the right kind of protection to prevent any unwanted pregnancy or infection.
There are lots of different types of contraception/protection out there and it can be quite confusing. So I've made a very simple table that sums up the basics: click here
This is only a rough guide - to get more detailed advice, have a chat with your doctor, local sexual health clinic, or go to the NHS Choices website.