Having sex is a big decision, and it's important to consider the potential consequences. STIs, HIV and unplanned pregnancy can be serious, so it's important to take precautions.
The best way to protect yourself is to use a condom every time you have sex (including oral or anal sex). But even condoms aren't 100% guaranteed, so it's important to talk to your partner about your concerns and get tested together, before you take the plunge.
Don't worry, you can still have a great time without putting your health at risk!